I find player levels to be uninteresting with the current system of a fixed 20,000 exp per level.
I would personally find it more interesting it if the experience required to level up increased with every level by a multiplication factor, like maybe 0.15. So eventually it would reach an insane number of experience points required to level up. This would make being a high level look more prestigious while feeling satisfying and meaningful for the player.
Obviously the current system is so you can gain cosmetic points per level up, and the above system would not work well with it.