ROL 2
Well ROL is pretty easy and the rewards are pretty average for an end game player. After you beat RTTL and 5.2 there is nothing challenging left except LOL which requires a R4 5* or a ton of units (cause of the enraged timer). There should be something more challenging than ROL and less challenging than LOL which can prepare you for LOL. Maybe you can just add more paths to the current ROL in which there are a little trickier champs or a higher pi.