How do you never run out of things to do?

I'm not in UX (but aspiring to be), so hence the noob question!

A lot of companies don't endlessly roll out features, which makes me wonder how a UX team doesn't at some point run out of things to do? Especially since I see a lot of teams being integrated into a scrum framework.

Again, sorry for the noob question, it's just not so evident for me as an outsider, which is why I'm asking 🙏 Curious to know what fields you're all in and what you research!