It really depends what you’re interests are. If you like art, start checking out artsy spaces and public events. If you like games try hanging out in game or card shops. It took me 3-4 months of showing up to art/music festivals before I started running into people I recognized and felt comfortable chatting up. My experience isn’t universal, but as a socially anxious person it required a lot of discomfort and patience.

Here’s the source instead of a paywalled news article https://www.cam.ac.uk/research/news/study-reveals-genetic-and-developmental-differences-in-people-with-earlier-versus-later-autism