Your point about matching enthusiasm resonates with me. I am fortunate nowadays that many of my friends are neurodivergent, and we seem to enjoy each others’ enthusiasm. We have some shared interests, but I think in a context where I can just listen and learn and not necessarily be expected to be a part of a “regular conversation” (i.e. when the primary mode of conversation is neurodivergent), I really enjoy listening to my friends nerd out about things outside of my own interest, as well as sometimes explaining my things to other people.
Outside of that framework though, before I had my current friends, I often felt like it was a smarter social strategy to just not talk about my interests at all because tempering my enthusiasm was difficult and seemed to never been enough.