ask yourself: why do you live where you are?
figure out the benefits vs the drawbacks (such as not finding friends)
i was in this situation, and i decided to move. you don't need to move, but being aware of why you made that choice, makes the downsides easier to bear, and also opens up new ideas how to approach the situation.
after more than 10 years in china, we moved to a small city where i had no friends, and finding friends was difficult. there were other benefits of living there, and so i reconnected with old (and new) friends from back home who, thanks to covid had started online meetings. you could say, i made lemonade out of lemons.
on online meetings, keep searching, there are many more groups out there, and not all of them are like the ones you experienced.
i realize that online meetings are no substitute for meeting face to face, but consider this: when i develop a good relationship with someone in person, (even just a good vibe after a single meeting) then this carries over into an online connection. so if you can't find local friends, find friends online that have a chance to meet face to face at least once in a while. (this should also help with avoiding those weird groups you seem to have found)
for example that hackerspace may be to far away for a regular visit, but maybe it is possible to visit once every few months? check if they have an online community. join that, get to know people online, then meet them in person once, and then continue to stay in touch online.
i am actually not big on online meetings myself. from the sound of it, you probably aren't either. but if you are selective, it's better than nothing.