Xeviat
Dungeon Mistress, she/her
I’ll consider that, though I may reduce the number of dice after low levels instead.
I've thought about sneak attack for the ranger before too. Are you concerned that it steps on the rogue's toes? Personally, I love when classes are designed with a mechanic that makes their playstyle different, but I'm not sure 5E has that:
Barbarian: Rage, Reckless Attack
Fighter: Action Surge, Second Wind, more Extra Attacks
Monk: Martial Arts, Flurry, and Stunning Fist
Paladin: Smite, Improved Divine Smite
Rogue: Sneak Attack and Cunning Action
In theory, Favored Enemy is the historic thing I'd be trying to lean into. It couldn't hurt to have it steal from sneak attack a bit, though. But, to make it different, having Favored Enemy be a mark that gives the Ranger bonus damage (similar to sneak attack progression, if you don't give extra attack you can probably get away with it) and tells the ranger things about the creature.