I'd like to see more fluffy feats that fold in a +1 to an ability score. For example I really like the Actor or Observant feats for what they offer for roleplaying, and since feats are directly opposed to ASIs in this edition it's nice to know that if you have an odd numbered score you might as well get a neat little trick in addition to increasing your modifier. But similar feats like Athlete, Durable, Keen Mind, or Linguist are severely underpowered. I'd like to see more options to boost a stat while branching out with a skill that cater to a wider array of personality types (a Charismatic Sorcerer may be personable but not duplicitous and the lying aspect of Actor wouldn't suit them well, or an Intelligent Wizard might not be the most perceptive and Observant's Passive Perception bonus isn't suited to them) and to make sure that every stat has a few of those options.

I also did like many of the Racial Feats from that one UA, and would like to see Volo's races get feats of their own.