Prestige idea for those grindy players - class specific prestiges.
Instead of forcing a full level reset, allow players the option to choose to reset their progress on a max level class with the reward of a weapon skin for one of their weapons. You could make it so it's a skin that is equipable by all weapons or even make it so It's one weapon at a time. This gives the player the ability to restart on one class and being able to fall back on a leveled class if they need a break from regrinding.