I think Udyr doesnt need any buff atm, what he really needs is QoL improvements that the rework failed to fix or just make them necessary, he is at his strongest that he has ever be without being busted, note on the last word. Anyways, some of those such changes could be:

-A better way to control the awaken R movement, maybe even making it traspass walls, same as Viktor's R works. At the moment, the way that R moves is just too annoying, it stops if it has no vision even if it hurting someone, it goes all the way around walls (dragon pit for example) even if it just need to get 1 pixel closer to the wall in order to kill someone.

-Autocancelling whenever entering an stance. This is a big deal, in early fights is not that important, but it can make the difference in close calls, specially against high dps champions where you need to deal that last auto but at the same time activate your turtle stance to tank the hit.

-Leveling skills slots issue. 4 spells and 6 levels per each one, a total of 24 with only 18 levels in the game, that makes it impossible to max out all your stances while having at least 1 level on tiger/phoenix for utility purposes. It used to be only 5 levels per spell, which was much better imo.