Like many posters, it depends on when you come in to "Save" it. There is no doubt that WCW dropped the ball after the infamous Jan 1999 "Finger Poke Of Doom". The move itself was absolutely brilliant, the NWO was a shadow of itself, WCW had no real dominant heel group, we had survived the whole NWO Black & White vs Wolf Pac nonsense, Kevin Nash face turn was over and convincing with fans without much change in his character presentation or wrestling style, and no one, no one, expected The Finger Poke and title change. Just the idea of Nash (who IWC fans knew was now booking the company) giving up the title so fast was a complete shock. The fact the Nitro twice topped 5.0 ratings despite airing directly against Raw after this happened proves the terrific shock value of the event.
Now WCW in 1999 was like a wrestling Who's Who of Injured stars...Sting, Brett Hart, and Lex Luger were all MIA with injuries. Goldberg was red hot and so was Flair. What they needed was a real enemy, and the Finger Poke storyline, which returned Hogan after his self imposed absence (seen by many as political to see if WCW could still draw strong ratings with Goldberg, Nash, and Flair in primary roles without him, which they did) and the reformation of a real, heel group, not the bloated NWO of 1998 filled with second teamers who's main purpose was to job out to WCW fan favs so the top stars would not have to. Getting rid of the oft injured Henning who was unreliable with a drinking problem, Horace Hogan, and Virgil along with Disco Inferno was a good move, it refocused the group, now basically a much leaner unit with the original 3 members alongside Steiner & Bagwell (his Buff Character had potential and he had charisma, at least in that role, he was worth keeping).
What kept the new storyline interesting was that for the first time since 1996 the group was on the offensive. Flair was WCW President and bent on destroying them, Goldberg was clearly cheated at Starrcade and looking for revenge. They had the World Title, but they clearly did not have control of the company.
WCW at this point had two major money matches and feuds waiting to happen, Goldberg's inevitable re-match with Nash who ended his streak, stole his title, and re formed the most dangerous heel group in the company since the heyday of The Horsemen ten years earlier, and Goldberg vs Hogan, Hogan once again had the belt but he had never avenged his loss vs Goldberg which made him champ in the first place.
Whether it was political or just plain stupid what WCW gave us was Goldberg effectively removed from the World Title picture and stuck in secondary feuds vs Scott Hall, who by this time was probably the weakest member of the NWO, his numerous bouts and absences due to drugs making him totally unreliable, he was back in the group due almost totally to his original connection and friendship with Nash, he wasn't a top tier performer at this point, Steiner was clearly more over than him. Now WCW did make money and draw a big buyyrate for Hogan-Flair at SuperBrawl, but the booking leading into that match made it look like Flair was finally getting over on Hogan which is what the audience had wanted to see for years. When they screw jobbed Flair again in ridiculous fashion with the David Flair interference and Torrie Wilson seduction storyline, fans finally started tuning out. This combo of de emphasizing Goldberg and screw jobbing Flair is when WCW really started losing fans, both casual fans and die hards.
Want to keep WCW's momentum....Have the NWO send Steiner after Goldberg with the clear intent to injure him and keep him away from Hogan & Nash. Put them in a specialty match like a Cage or No Holds Barred at Souled Out, with Goldberg winning. With the NWO still stalling, have Flair push Goldberg-Nash at SuperBrawl, with the winner getting a title shot. Eliminate the David Flair storyline altogether after Souled Out, no son turns on Father stuff, have Flair beat Hogan at SuperBrawl.
This creates much tension between the NWO as by now, heading into March, they've lost the World Title and Goldberg is in the title picture. Lots of in fighting, etc, teasing a break up. Have Hogan interfere to stop Goldberg from beating Flair maybe on a Nitro, leading to an all out Hogan-Goldberg feud. Have Goldberg win the money match between them, with Nash interference backfiring and causing Hogan to lose when it clearly looks like he is going to win. After a Nash-Hogan dust up have Hogan try to oust Nash but Bishcoff & Nash combine and the NWO dumps Hogan, who can disappear for a month or two offscreen.
After this, leading into the summer, I'd have Nash and the NWO beat Flair and get the title back. Flair is still WCW Pres and keeps much heat on the NWO, trying to keep an even playing field. Goldberg can feud with other members of the group as Nash tries to avoid him, plus by now you have Sting, Luger, & Hart back in the ring, plus DDP, lots of potential here with this group. By Fall Brawl I'd have Hogan make his surprise return, in the red & yellow, as the last member of team WCW vs NWO War Games Match, with caveat that a member of Team WCW gets the title shot at SuperBrawl if they win, which they do. On Nitro, a four way elimination match would make Hogan the winner, and we'd get a full out Hogan-Nash war through November, with Hogan winning the title at Havoc. This would set up Hogan-Goldberg at Starrcade, Goldberg with the only clean win in their brief, two match series, with much made of Goldberg's year long battle to get back in the title picture. Starrcade ends with Goldberg winning the title in a face vs face match with a teased Hogan heel turn that never happens.
As for the undercard, there is so much you can do with Steiner, Flair, Sting, Hart, & DDP, plus the Eddie Guerrero was still here, as was Benoit, and Misterio. As it was Hart pretty much did nothing most of 99, really not being involved in much of anything till the end of the year. Same with Luger. Sting was used a lot from the Spring On (better than Goldberg), Steiner, Flair, and a returning Randy Savage had brief spurts of good use with long stretches of futility. It's easy to see how you could improve on any of their use going forward.
So Id eliminate pushing Goldberg into the mid card, eliminate the SuperBrawl screw job of Flair, keep the NWO intact but eventually push Hogan out allowing for his face turn (which was the backstage reason the NWO folded in the first place, Hogan suddenly decided he wanted to be hero again), no Flair heel turn, the Sting heel turn later in the year wouldn't happen, and Goldberg -Nash would be a real, fully invested fued with Goldberg winning. The World title would fairly stable switching between three guys (Hogan, Flair, Nash) with Goldberg winning it in the end. Heading into 2000 Goldberg could start feuding more with guys like Sting & Hart & Savage, stars he rarely faced but main event caliber players capable of keeping of selling tickets. You could also have a full on Hogan vs NWO feud pitting him against Steiner, et all after his run vs Nash concludes, basically have the NWO decide after Starrcade that Hogan has to be destroyed once and for all. I would also invest heavily in the tag team scene, something that was lacking in WCW post 1997.