I wasn't ready to become the maintainer of Babel. After all, I had never published my own npm package or explored much of the codebase. But slowly (sometimes really slowly) I got used to it. I recall Kent C. Dodds saying that if you want to be a maintainer, just act like and do the things a maintainers does.
Sounds easy enough 🤣. I particularly enjoyed the linked post on imposter syndrome from Rachel Smith.