How should I prune this avocado tree to control height?

This avocado tree is about 14–15 ft tall and has one strong central leader growing straight up. I’m worried it will become too tall to manage or harvest in the future.

I’d like to shape it for better structure and easier maintenance, but I’m not sure where to make the cuts without harming the tree.

If possible, it would really help if someone could edit the photo and mark where pruning cuts should be made.

Also open to any general advice on the best way to prune avocado trees.