I'm level 14 and have 32 for league, 35 for CL, 39 for cup.

I think as long as you find an optimum price for league matches so that you get +5 possession then +3 for CL, +7 for cup.

Sometimes you don't always get full capacity but still get +5 possession, in this case, bump your ticket up by 1 and , as long as you still get +5 possession, you will get more revenue.