re: I'm a heel striker runner, how do I train to run on my toes?

Ease yourself into it by getting comfortable walking barefoot. Doing so on good dirt and grass has the added benefit of helping ease stress. It'll probably feel weird at first, but work your way up to jogging barefoot on suitable ground.

Learn to pay attention to your body mechanics too, which pays dividends over time for your whole body. Work on not letting your feet get far ahead of you, so you can keep your weight over your foot. Then, as other's have said, ease down into zero-drop or minimal drop shoes.