Why not take a leaf out of diablo 3's book and do paragon levels.
Put a cap at level 50, then each level gained after this is a paragon level in which players are given an ability point (system is already in place) they can spend in different categorys (Defence - ac/amc/health - offence mc/sc/dc/mana , maybe another two categorys with other stats (agil,acc) (a.speed,crit,holy) at lesser intervals.
Each paragon level it could alternate between what you can spend your ability points on, one level it would be a defense point, next level an offence.
You could add new gear and spells which requires certain paragon levels etc.
So essentially you will still be level 50, but like level 10 paragon etc
my 2 cents.
This.
Paragon levels would work well in open world environment like mir. (10Paragon levels for a lvl 4 skill 20 paragons for a level 5 skill) each paragon gives some kind of hermit stat...
