It's good to get familiar with a wide variety of softwares. Often, being exposed to the strengths and weaknesses of something new is a good way to broaden your experience level.

But that said, there's not a lot of point in changing things just for the sake of change. I've been running Debian since around 1998. It's fine. I like it and I'm happy with it. I tried a bunch of things over the years but haven't found anything that suits me as well, so I keep running it. The only distro that really has caught my attention as something with enough of a new thing that might be checking out was NixOS. But, if you're happy with what you're doing I wouldn't say there's anything wrong with being happy with what you're doing.