How rural are we talking? My ISP has horrible throttling that translates into frequent latency spikes, so I got a phone specifically for its data plan and that works fine (110ms). If you're even further out then your only option is to wait 1-5 years for Project Kuiper or Starlink or another LEO satellite provider.

If there's no way to get down below 500ms you're going to have a really bad time with this game, unfortunately.