how to improve players performance

[festinator]

If they play 2 positions, you can try moving them around and see if the play well somewhere else.

[Golden Boys FC]

If they play 2 positions, you can try moving them around and see if the play well somewhere else.

Agree 100%

Same as if you play two strikers, chances are one of them will perform better on the right rather than on the left or centre (and if they perform better then there moral etc will be better)