Aldarc
Legend
I would truncate and streamline the 4E gameplay, learning a lot (ironically enough) from the innovations of the OSR and PbtA movements. Give a lot of options for every class but not an overwhelming amount that slows down play or leads to decision paralysis (a commonly cited problem with 4E). Maybe consider rewriting classes as PbtA-style playbooks so (nearly) everything a player needs is already on the character sheet. Maybe even lower the level cap from 30 to 10-15 (i.e., five levels per tier) and flatten the math. Expand the exploration and social aspects, moving them a bit more forefront than is generally assumed that 4E has.