That was my experience with Feren OS as well as, Makulu Lindoze. Both OS's had memory leaks. And both developers showed no real interest in getting the memory leaks fixed.
The answer was very simple, go back to Zorin OS where I started from. But then Zorin OS 16 got severely delayed, and since I was buying a brand new machine this year, I needed a modern kernel, so I got onboard with POP OS.
But the truth is, I love both POP OS and Zorin OS, both of them are equal IMO. Both of them do great things, and both do them well. From your description, sounds like Debian is nothing but trouble, I say forget it lol.
There is a 50/50 chance that you will like Fedora. But ultimately, I think you will return to Zorin OS before the month is over lol.