if you want to write a ttrpg, here's my advice
- figure out what big one you want to write
- shelve that, write a small one instead
- find someone who's written a few small games to chat with about your big game
- find someone who's burnt out before releasing 3 games to chat with about your big game
- find someone who's released a game to chat with about your big game
- find someone who you perceive as big on twitter without any evidence to chat with about your small game, intimate that you have a big game in the works and be shy about it.
with all of that covered, what I actually recommend is get involved with a ttrpg community that is in the throes of playtesting. You want to meet people who are playing ttrpgs because you're going to find people who will match your freak. find a group that vibes good etc.
Figure out that one big ttrpg you wanna write
Work on it for 10 years in secret
Put it out for public playtesting
Find your freaks