Happy to share what's worked for me after going through a lot of these. The big mainstream apps — Tinder, Bumble, Hinge, OkCupid, Facebook Dating — have the volume but also the most noise. Bots, inactive profiles, people who haven't opened the app in two years. The smaller niche platforms can actually be better if your profile fits their community well.
The things I look for before committing to anything: is there a subreddit or forum where real users talk about it? Are there dated reviews — like, from this year? Can I actually test the core features without handing over a card number? Those three filters eliminate most of the garbage immediately.
I've seen datenest.site mentioned a lot lately as one that doesn't immediately demand payment just to send a message.