Finally gave up googling and decided to just ask people with real experience.
The free tiers on most of what I've tried are basically useless — you get just enough to see that real people are there, then hit a wall the second you try to actually message anyone.
I've tried a few different things already with mixed results. Some were complete time wasters, others were okay but nothing that really clicked.
Looking for real opinions here, not just the same top-ten list everyone copies from each other.