It is difficult to change the behaviour of a child who is a fussy eater.
If you try to punish, you reinforce the negative associations of the food they don’t like.
If you try to reward you remind them that the reward is so much better than the food they don’t like.
Sometimes, motivation is difficult. You seem to be forever reinforcing the behaviour you don’t want.
The same can be true of a workforce. You have to think very carefully about ways to successfully change – and maintain – behaviours you want to see.
I’m not giving answers here. The answer depends so much on history and context. I’m just asking you to think before you act, reflect after you have acted and make no assumptions.