Best month-long bike trip in US? Comment your tips!!!

A friend and I are planning to go on a month-long bikepacking trip (road biking) in the US this summer. I'm curious to hear if anyone has a route recommendation - there's lots of different options and it's hard to decide. Looking for something beautiful and a good combination of challenging and fun!

Also would be curious to hear any and all tips! Gear suggestions, resources, things to consider, what we should definitely bring, etc.

Thank you!