Sometimes, saying ‘I need help with the household chores’ isn’t going to register in his head. When it doesn’t, tell him specifically which chores you need help with.
You can say something like, ‘Please take the trash out’, or ‘Please mow the lawn’. That will make things easy for him. It sometimes helps to show him the kind of help you need because sometimes the reason he doesn’t do it is because he doesn’t know how to get it done.