For example Red Hat Enterprise Linux or SUSE Enterprise Linux.
I’m considering switching to RHEL, to get a “professional” Linux, since it’s free if you register an account, but is it worth it?
Is the experience very different from Fedora?
Much more stable but much, much older packages at some point. Can you tolerate that?
It is a lot easier these days as Distrobox and Flatpak offer great escape hatches to get newer software when you really need it.
Some of us fiddle with the base OS more than we should. In many ways, I think using something that changes less often is a great idea.
One great thing about RHEL is the documentation. First Red Hat themselves make great stuff. Then there are mountains of third-party materials. Finally, since it changes slowly, whatever issues you are facing have probably been seen before by others and what you find about it on the Internet will still apply.