So I have a decent amount of legends and SEs but am still struggling to find the best way to utilize them all,
any suggestions on a great lineup?
What does your team do?
There is no strategy behind your lineup. Invest time in discovering the strength of your monsters and think of combos which might work. Especially with atras in PvE. I would highly recommend as well to finish advances and master league to have 206 points in cresting a team. You should be capable to finish the leagues easily