My son is addicted to Fortnite/video games

I am concerned about my 13-year-old son’s addiction to Fortnite, he has no interest In doing anything else other than playing video games and gets angry when I don’t allow him to play, I don’t know what would be the best way to go about it, I’ve tried talking to him and have told him that it’s ok to play once in a while but that when it becomes the only thing you want to do it’s not good, I have his game put away and told him he can only play once a week if he comes through with his responsibilities, has a good attitude and starts doing other things.