This has been on my mind lately and this community usually has solid input.
The free tiers on most of what I've tried are basically useless — you get just enough to see real people are there, then hit a wall the moment you try to message anyone.
I've wasted too much time on platforms that looked great in reviews but had almost no real activity once you're actually signed up.
Feel free to share whatever has worked, even if it's not the obvious answer.