I just heard about the #FairRepresentationAct, which seems to aim to do a lot to inhibit the impact of gerrymandering.
More information about it: https://fairvote.org/our-reforms/fair-representation-act/
Ask your rep. to support it with a couple clicks: https://p2a.co/ZraNU5n
(Put in your information, and it will identify your representative and auto-fill an example email. Sending *something* is more important than what you write, so you can just send that template if you don't have time/desire to write something else!)