you should COMPLAIN LOUDLY and FILE BUG REPORTS.
Guess what - I did, for a long time. I even ran updates-testing.
Truth is, most of the reports were closed by the end-of-life auto-close daemon without even beeing looked at by anyone.

My conclusion is, that there are enough testers and the main problem is not testing but bug fixing.
Therefore, I will simply wait 2-3 months after a new Fedora version has been released. The only downside is, Fedora installers in the release images are badly broken each time - so the big question is whether it installs in the first place before applying updates