I currently have lots of misses between hits and find it boring for other reasons. What did they change?
I feel like if they are going to have different difficulty levels, I would want the effects of those levels to be relatively transparent. "The dice are kinder on easy mode" could be effective, but doesn't really communicate what's going on. It's pretty fuzzy.
Adjusting stats on NPCs and monsters (which potentially impacts their HP, AC, attack bonuses, spell save DCs, perception bonus, and in-conversation DCs) would work - still a little fuzzy.
Adjusting the PC's proficiency bonus would be clean, easy to explain, and would make you consistently better/worse at the things you are trained in.
You could also get more/less points for your stats during character creation.
