Stealth

generally speaking, feats shouldn't give more than 1 ability score point (this one gives +2), because at that point its literally just an ASI but better

like if I'm a rogue or a ranger or someone else that wants to bump my dexterity, I have to make the choice between a feat and just going for +2 dex, but there's zero reason to take an ASI for +2 dex when I could just take this feat for the same thing PLUS two expertises in relevant skills

also you should probably mention a cap on the dexterity to clarify it doesn't go over 20 (which I assume is the intent)