There is no max level
After level 60, the levels contunue in the same progression as before. I surmise the max level should be attained by getting at least 1 ak scroll in the main arena that should be bought asap, and at least 2 more in the various areas. Level 3 learning ASAP, anything else that provides xp is a bonus. Dying is ok if it will open up more hands of necropolis (only if necessary), but it does give a -1% bonus to the score.
You know I have never seen a game so far with 2 hands of necropolis. I thought that was disallowed in the expansion.