How to get better at heel hooks?

I am about a V7-8 climber and I am horrendous at heel hooks. Whenever I see really good climbers they seem to be using heel hooks all the time and it almost seems like a cheat code.

I want to get better at them but don’t really know how to practice. When I try them on easier climbs they feel really forced and unnecessary and when I try them on hard climbs I can’t get them to work because I am bad at them.

Any advice how to practice them?