Like the title says, currently being able to just retreat forever and kite opponents while attacking them from your max range is both incredibly strong, and very boring. Same for immediately rushing people down and getting into hug fight range while completely disregarding the threat posed by the other player.
Any way to make people's forward mobility greater than their backwards mobility would be much appreciated, but imo a very quick and simple fix would just be adding a force to slow down any movement backwards if it's past a speed threshold, and forwards, at a slightly higher threshold. (Not make all back moves slower, just slow down the faster ones to the point you can catch up to people,) Same for forwards mobility, though maybe(??) to a slightly lower extent, to limit the amount of crazy rushing and favor more thoughtful gameplay.
Alternatively, something like a stamina system, that limits overall mobility to short-ish bursts would also be welcome.