Privacy or pool size, pick your problem
Almost every reason for leaving Feeld falls into one of two buckets. If you want less of yourself on display, Pure is built for exactly that and scores highest here on safety. If you want more people, no specialist app will beat a mainstream one, so the move is Tinder, OkCupid or Badoo with a bio that leaves nothing to guess.
What you lose by leaving
Vocabulary. Feeld lets you name relationship structures, link a partner, and be understood without a paragraph of explanation. On mainstream apps you will do that explaining yourself, repeatedly, and some of it will go badly. Budget for that before you switch.
Queer users should look at the specialist apps first
HER and Grindr are not open-minded apps in Feeld's sense, but for queer women and queer men respectively they have both the community and the numbers. Where Feeld is thin, they are usually the busiest option in the same city.