I'm a homebody, but we like going to farmers' markets, street fairs, craft shows, car shows, etc. Our library has a ton of things for littles, and there are always things like MOPS (MomCo now).
I browse Facebook events and my city/county websites for events that sound interesting or fun. I try to make it a point to find new parks to explore and check out, even if they're super small neighborhood parks. Library for sure as well. If you enjoy cooking there are lots of themes and experimentation that can happen there too. Moms clubs if you're looking for more friendship, and visiting museums could work too. I guess it depends how old your kid is and where you're located too
Look into annual passes where you live for kid friendly things.
Look for groups in your community 💁 we have a lot through our city and library.