I think Timothee was smart to focus on other works and not jump into Marvel/Superhero stuff too soon. The problem with doing that is sure, they are immensely popular and you can be set for life off one character (Tom Holland). But if you're looking to be a respected actor, as I think Timmy is.... you would want more than just that to your name.
He could venture into Marvel at some point but he's got to build a resume first that stands on its own so that whatever character he plays later won't define him. This is the problem Tom Holland is having... it's the same problem Chris Hemsworth has now. Hemsworth is a multi talented great actor, but all anyone ever knows him as is Thor - despite doing a wide range of other things.
Andrew Garfield has been moderately successful breaking away from that stigma, but Garfield was also probably the least popular Spiderman of the three who have played him, and only got 2 movies from the role while the others got more. Even so, when people see Andrew in a different film, they will often say oh look its Spiderman. Because unfortunately that is still how a lot of people know him.
Timothee is smart to build a resume first and that will define his career as an actor, before jumping into the superhero scene too soon and having that become his defining trait.
