What if the serum never happened and Steve had to stay in NY and work at a shitty factory and earn minimum wage and just do some art on the side.
And bucky was kidnapped and experimented on and became the Winter Soldier way back when.
And after the war Steve starts doing comics featuring a dark haired superhero who goes missing in the war. He gets fairly famous and everyone is like wow Steve that’s great here have some money, so he can finally afford some health and food and he’s, whatever, content, for lack of better word.
But he can’t really let go because he never heard anything about Bucky, and he knows a lot of people went missing the war but he needs closure at least so he starts researching and pokes around, because money, and eventually Stark senior finds him and tells him that he has two choices, he can continue looking into it and fuck up his whole life, or he can go back to being a regular person and forget all about it.
And Steve chooses the matrix and Stark gets him into this super secret organization he’s organizing with his friends and Steve has no idea WHY Stark is doing that because seriously he’s a nobody and can’t even fight, but Stark recognizes Bucky and knows a part of what happened to him and thinks Steve can help.
And they somehow capture Winter Soldier and it’s Steve’s turn to bring him back, emotional angst idk the end.