300km/h trains are normal without maglev as well. The record for maglev is faster than regular rail, but the record for regular rail is much faster than any in service maglev. For rail the limit is aerodynamic drag which has nothing to do with the wheels. So that maglev can go faster in ideal situations doesn't matter as in the real world you will run the trains much slower. Around 300km/h seems to be the best compromise of going really fast while still not paying too much for aerodynamic drag. You can run trains faster (and a few do), but the energy costs get out of control.

If 300 km/h isn't good enough, then get on an airplane. The altitude means much lower aerodynamic drag and the distances you are traveling often need airplanes anyway. Trains are good to around 1000km of travel distance. If your trip is longer fly.