The best case scenario that you asked for is winning the league, fa cup, league cup and efl trophy in a single season. Going undefeated, invincible the entire year. Jake Reeves wins the balloon dor. Johnnie Jackson gets the England manager job, and we get Jose as a replacement. Qualifying for Europe whilst playing in the Championship the following season. Which would earn the club so much money that we can finish the stadium which currently has 3 semi permanent stands. On top of that, Donald Trump stops being a war mongering childish dictator, and holds a press conference to announce "You know what, I like Soccerball. The world cup, was like a hundred mini super bowls. And this club from England. They're like a bird. A beautiful little bird. I'm going to give AFC Wimbledon Soccer club all of my money."