Still Cannot Win Galactic War, Can someone help me?

yeah - all good advice here. Multiple teams is a must - synergy on teams is another. Pinch hitters as mentioned is always a good back-up plan. Toons that can jump in and not mess a lot of synergy up - Boba, JKA. The retreat button is your friend but sometimes you can get wiped so fast, there's just no chance - or EP stuns the whole team and you sit there watching your good team get turned to dust. It happens, build a diverse roster, and you'll do better.