It’s not primarily made for monitoring, but Dockhand has a lot of great monitoring for your whole host and for individual containers.

+1 I love the easy integration of Gotify.

If your current setup is satisfying your needs don’t change it. Linux Mint is quite similar to Debian when it comes to the base.
If you want to try and learn new thing maybe look into Bash scripting or Docker. Think of something useful you would like to have and try creating it.