#3 Form a faction of babyfaces to take on Undisputed ERA
As they say, there's strength in numbers - and if there's one thing Keith Lee knows, it's strength.
Now, this point isn't mutually exclusive from the previous two entries on this list. Quite the contrary. We could very well see a team of faces - say Lee, Tommaso Ciampa, Matt Riddle, a returning Johnny Gargano, etc. - banding together to counter-act the ERA's constant interference in their title matches (or just matches in general).
Historically, factions have worked better as heels, but babyface groups aren't unheard of. Degeneration-X spent quite a bit of time as faces while feuding with the Nation of Domination, the nWo Wolfpac was incredibly popular in the WCW days, and the The Union... well, OK... the less said about them, the better. But, they were still a thing, so it counts!
In fact, back in the early 1990s, Sting and his pals formed a loose collective of faces called the "Dudes With Attitudes". It wasn't an official group, just the name given to other good guy wrestlers sick to death of being on the receiving end of attacks by the Four Horsemen. Lee's War Games team would be a good start to a group like this.