I had a DM that had a real cool house rule you might want to try.
Every round the fighter (well his rewrite of it) got a d6 to roll to add to either a str dex or con save, or attack or skill check. If you roll a 1 you lower your die to a d4, then if you get a 1 again it goes down to a d3 then goes away. if you roll max you increase the die code to a max of d10. When you take a short rest you can expend a HD to reset your die to d6. When you take a long rest you auto reset it.
Then he had not only the battle master maneuvers but these cool supernatural ones that allowed you to flank with yourself, or get past resistance or even immunity and ones that allowed you to attack twice. However some required you to have the die code to a height and other required you to automatically lower the die code.
Some he called stances and had cool add on that lasted with concentration, but some just were fire and forget. I have to see if I have his list, it started with 1st level ones and went all the way to 9th level following the spell chart for full casters.
Some I remember had a lower the die code 2 steps to move to a spot in 30ft as a bonus action with no terrain or attacks blocking it. one where you just delt that code of fire damage as you lit your sword on fire, and my personal favorite was you needed a full d10 but you lower it 3 die codes (so back to your d4) but you gain 1d4+1 actions you can take while enemies could not react.