Seems that you should consider starting your own business or be a freelance corporate trainer/personal coach.

* A lot of challenges so you don't get bored easily.
* You get to use your people's skill and bring service to others.
* You can make use of your past experience (being a trainer, closing sales).
* No ceiling (and floor) on income.

If you do decide to become a trainer, maybe as a start you could focus on charitable organizations.