They should be dropping prices, not raising them, at least for longer trips. It costs about the same to take Amtrak vs an airplane for a direct connection 750 miles away, which is ridiculous because it should be far cheaper to run a train at 60mph than an airplane at 400+mph per passenger, and trains can carry far more people than airplanes. They also need to be way faster (120mph at least, ideally faster than that) to be a reasonable alternative to airlines.

The only way Amtrak gets to raise rates is if it drastically improves service.

Trains need infrastructure all 750 miles of that trip. Airplanes need infrastructure only at each end of the trip. Thus airplanes are cheaper to run very long distances.