always give max ratings for every worker interaction unless they like do something actually criminal to you.

also surveys, sometimes you can seperate corporate shit from the actual workers but often those surveys punish for overall rating. and if any place has a "recognize an employee" for something totally do that to even if you make up some bullshit. might not do much for $ but it will take pressure off them, maybe they get a gift card or pizza or something nice you never know.