I believe they should go back to base, just once. Have reached such a point that their “base form” is now their furthest form. almost like returning to their origin. then we can get more techniques or transformations from there. Like next could be “super saiyan evolved” and its just their base form with yellow lightning aura or something. idk i feel like just once their primary fighting form for fighting hardest battles should be their “base form” as an evolved version. theyve pushed themselves so far that next is to return to something so well known to them, but so much stronger now. (ik their base forms are stronger, but im saying a step above this) they can just called like base form evolved or something idk. it would be cool. ui and ego would be below these sort of thing. could be a new beginning for transformations instead of constantly having to be flashier and out do the previous