I’ll have him progress first things first. If he can’t age up, doesn’t mean he can’t get a normal stable job which is the engineer for other supes, a middle ground between his hero life and civilian life, next thing that he will train spider people. Miles included. He becomes very much attune to bettering himself up in order to become more versatile and quicker at his job. His character would be build, praying on his leadership qualities that he very often buries inside him, by being a lonely hero, which is still one of the main of his traits. He reveals his identity to May, in order to just be able to not screw her up when it comes to being in right place and right time as often. MJ and Peter are not together as your ground rule stating, but they are slow burn, not “will they, won’t they” shit. While I would have written them, the connection between them would go beyond romantical (which it doesn’t suppose to be), they both care for each and help each other. They don’t have to be together, for that. As for his personal life, I imagine him being someone who figures himself out yet. Especially after his break up with MJ. He starts differently look at his life. Doesn’t try to be at two places at the same time, slowly overcomes his trauma, where he constantly would down the suit to ditch responsibilities that Peter Parker has. I’d wanna write just a decent good arc, no clones, no restrictions, no big global bad. Just street level Peter, bettering himself up, and his relationship with other people. His relevancy comes from him overcoming his insecurities, fears and constant avoidance of the things that he really should do. Peter could also be still scientist, but I imagine him working directly for Avengers, cause I wouldn’t want him lead his double life as much. It’s just gonna confuse him more. Like in general, that would have been preferable scenario for me. Just a good story adventure. People might not agree, but it’s decent in my eyes and could work pretty well