I’m running OpenSUSE leap 15.5, When I was on the linux mint, I was using warpinator but using it on openSUSE is troublesome and I wish there was a linux version of blip but unfortunately there is not.
If you turned off battery optimisations globally, it might still kill it. You specifically have to go into app options and allow it to be always on, as well as allowing all it’s notifications
Sorry, I meant optimisations for KDE Connect in particular. It has a persistent notification enabled as well.