1. Battlemasters maneuvers being available to all martial classes, with battlemaster having more known/more usages/higher dice.
Having all character number of maneuvers know, number of d6 dice to fuel them equal to proficiency bonus.
2. rework of races
3. Rebalancing martials to be a little bettter comparing to full casters.
HDs/HPs by classes:
d12: barbarian, fighter, monk
d10: artificer, paladin, ranger, rogue
d8: bard, cleric, druid, warlock
d6: sorcerer, wizard
also have all d10 and d12 classes at least 1 fighting style and one Extra attack feature.
d8 and d6 get their with some special features of certain sub-classes.
4. rework bard and warlock as 2/3 casters, similar to 3.5e
1st level spells at level 1
2nd at lvl 4
3rd at lvl 7
4th at lvl 10
5th at lvl 13
6th at lvl 16
7th at lvl 19
5. Make short rests short again. 5-10 mins long. 1hr is not a short rest.
6. Sub-classes from level 1.
7. limit of abilities to 18(+4)