Great phone - I’m currently using one.
Two gens back from the current latest iPhone 12.
The iPhone XR, 11, and 12 have the same 6.1 screen size.
The only thing I sometimes miss vs the iPhone 11 is night mode for the camera. But not a big deal.
Reference pricing since Apple still sells the iPhone XR,
new, direct, and with 1-year Apple warranty vs this Woot, used with 90-day warranty:
64 GB $499 new vs $310 here.
128 GB $549 new vs $360 here.
Look at the storage actually used on your current phone. You might find 64GB is perfectly fine if you have “Optimize Photos” turned on. Optimize Photos keeps a thumbnail of your photos and videos on the phone and downloads the original resolution when you open the photo/video. (I do not have it on, but it tells me I could save 45GB if I did turn it on.)
Did Apple make a XR MAX like the XS MAX?
No. But note the iPhone XR screen size (6.1”) is actually in between the iPhone XS (5.8”) and iPhone XS Max (6.5”)