Just finished SoL3. I'll probably use next week to clear the monthly missions, but after that it's time to start doing 4-crown, as well 2-crown UL. I wonder if I'll manage to clear both by the end of the year, but even if not, after I do, armed with a lvl.50 TF Idi, it'll be time to start Zero Legends (as well as 3-crown UL, obviously).