Can I deadlift 4 times a week?

Hey Mark I was wondering could I deadlift different variations 4 times a week?

I plan on doing conventional deadlifts/ low rack pulls on my two back days, sumo deadlifts on one leg day and hex bar deadlifts on the other leg day.

Is this too much? My deadlift is plateauing and that's the reason I want to up my DL frequency 

Thanks!