To #FDroid users, you might use #NTFY for having push notifications.
If you are rate-limited or want to test un another distributor, you can use #Sunup
It is an UnifiedPush distributor using Mozilla's push server. It is very easy to use.
https://f-droid.org/en/packages/org.unifiedpush.distributor.sunup/
Source code: https://codeberg.org/Sunup/android
@apps
Ntfy did not work. Sunup works for me.
Pixel 7pro, stock Android 15