I think the next Spider-Man movie should be Spider-Man but in a mental health institute, as it would make the most sense. In the latest Spider-Man movie, the plot revolved around the fact that everyone who knew Spider-Man were Peter Parker was slowly being teleported into the Marvel Cinematic Universe. To stop this, Peter Parker/Spider-Man asked Doctor Strange to make everyone forget that Peter Parker is Spider-Man.

This shocked Doctor Strange, as the spell would make it so that even he would forget that Spider-Man is Peter Parker, since it had to be everyone. However, this also means that Tom Holland’s Peter Parker should forget that he is Spider-Man. If he were to remember, then Spider-Men from all over the multiverse would continue teleporting into his reality.

To fix this problem, Peter Parker must not know that he is Spider-Man at all. As the movie comes to an end, you can see that they have already implemented this—since you only see Spider-Man in his new suit at night.

So my theory is that Peter Parker/Spider-Man now has two personalities: one that is Peter and the other that is Spider-Man, kind of like a Moon Knight scenario with multiple personalities.

The next movie should definitely be about Peter Parker going to a therapist, as he would wake up bruised and injured, not knowing how he ended up that way. The therapist would obviously think that he was either crazy or a danger to himself and others, as he would just keep getting these unexplained injuries. Because of this, they would send him to a mental health institute to try to help him through this period of his life.

At night, the Spider-Man personality would sneak out using his powers to fight crime, but since he can’t win every fight, he would still come back bruised and beaten. This would make his caretakers even more worried, so they would eventually put him in a padded seclusion room in a psychiatric hospital, with a straitjacket, to stop him from "hurting himself."

That is how the next Spider-Man movie should go.

The movie would be called: Spider-Man: A New Home.

As a post-credits scene, you would cut to Peter Parker five months later, still in that cell—now much more crazed, with wild hair and a big, unkempt beard.