For me it was not learning the ins and outs of MUT; I made way too many mistakes by being ignorant of how events/tokens/promos worked in MUT.
I just learned that when a promo drops, there is a page on the MUT.GG homepage that tells you who all the players are and what their Ability discounts are...
https://www.mut.gg/news/super-bowl-part-1-steve-young-jamal-lewis-ltd-ronnie-lott-and-more-mut-25/
I didn't know how good the Abilities of the Superbowl players were until a few days ago.
I'm still not sure if I will pick up Madden 26 and commit to another 1000+ hours (when it's all said and done), but I will be ready :)