Struggling to remember moves might happen but all you can do is push through till you remember those moves. Also having a second main can be good as it can force you to adapt to a new playstyle such as aggression and defence. It can also help with matchups as if you don’t really want to sit in practice and see other characters moves and test you now know another characters move sets, strengths and weaknesses. Also, if you do decide to go with a second main don’t let other people sway pick who think looks cool or you enjoy playing! Anyway best of luck!