You could try to incorporate a new type of fun into what you are doing, so your still polishing the same skill set but your not doing the same thing over and over again. Spice it up! Make it fun if its not fun enough :)
I've downloaded Mudbox for fun and it was the first time I was trying to sculpt something. No tutorial or any courses, just having fun, starting from a cube and trying to understand how the software work! It was fun, my sculpting surprisingly ''look like something''!