I agree. Kaladin is my favorite character, and I personally loved his arc in this book. However, it is getting tiring to watch him getting ground into the floor again and again. Going forward, I hope he does grow into a role of helping and protecting others with mental health issues. The part in Part 2 where he and Teft brought out Noril is one of my favorite scenes.
That said, if Kaladin does turn into a therapist, I'm guessing his role in the plot will decrease. The Stormlight Archive is focused on the Desolation and the Contest of Champions (10 days???), so there's less time to watch Kaladin revamp Roshar's approach to psychology. Besides, it would probably be difficult to write a major character that isn't really struggling with anything, especially given the Stormlight Archive's focus on trauma and internal character journeys.
Kaladin is a big part of why I love these books, and it make me sad to think his role might decrease. That said, if I had to choose between giving Kaladin a major plot role and getting him to a healthy place, I'd choose his well-being.