I used to join entrepreneurship groups, but 5 years later they're still sharing motivational posters on Facebook. I did find a good group by joining accelerators and pitching classes.
I'm in a very good group with some of the best engineers I've met in the field. But it comes at a cost of having to hold an engineering job.
Back when I was freelancing, I'd hang around people who were actually making good money off it. But after no longer freelancing, that group also mysteriously died down.
If you want to meet people who are committed, you have to commit to something.