I have a grey tux that was scared as shit.

There is a way

Find the most delicious food out there for a cat. Not kibble or anything. Like cook some steak. Throw that steak at her till she realises its good. Then hold it out. Get her eating out of your hand.

Continue for a good week. Dont ask anything of her. Then start doing training work. Watch cat training youtube videos.

And apply said learnings.

My feral gray tux is the smartest cat I’ve ever had. He knows multiple commands and is so friendly now he sits on the very large dog that used to scare the absolute bejebbus out of him.