I found out you can increase player's work rate through press conferences
So I started doing press conferences because I want to keep morale up.
Ever since I started, my players had more control and I've had better results.
One of the things I've been doing is constantly harping about working hard every time the option shows up as a response to the presser questions.
Within a couple of seasons, I've had some of my players gain anywhere between 1-3 points in Work Rate.
I've also seen increases in determination when I kept saying the players are determined and raring to go etc.
Will post screenshots of their growth later when I'm on the laptop if anyone wants them.
Most of my players had a +1 growth. These three are the outliers.
Update: Screenshots