How to help core developers?

I saw that there is a ton of unreviewed code in Cpython’s GitHub repo. It seems like the core developers are severely overwhelmed by the amount of work they need to do.

Is there anything us, regular contributors, can help with to alleviate that burden outside of just reviewing code? (which is also a great way to help but it feels like there’s more work than that and I just don’t know about it)