If you're already on Mint and it works for you it's a great OS to work with, so no inherent reason to switch. However if you look for something more modern with the same Desktop Environment as Mint (Cinnamon) perhaps Fedora Cinnamon is something for you (doesn't use apt though). The most modern features you'll find on a distro with KDE (Cinnamon for example is behind with support for modern stuff like HDR).

You'll get tons of recommendations when it comes to modern KDE distros. Personally given you said you're a beginner I'd suggest giving TuxedoOS a shot, as they

• Got the Nvidia drivers preinstalled
• Are based on Ubuntu (Best compatibility)…
• …which is the same base as Linux Mint (so .deb still work)
• Got the App Store all set up optimally (some distros don't)
• There's a hardware supplier if you ever look for sth.

Some negatives:

• Comes with Tuxedo Software superfluous to you (removable of course)

Depending on your beliefs it might be a negative that it's made by a company. However Tuxedo is based in Germany (therefore GDPR applies), they've people work full-time on it and a good track record for many years now. Also having the Nvidia driver pre-installed is really good in my experience, only very few distros do that due to license stuff. Otherwise of course there's also Kubuntu or Fedora for something with KDE. You can test all of them on DistroSea in your browser.

Feel free to ask anything. 🙂

I use NixOS on all my machines, much less pain and suffering than I've had on other distros.