Totally agree about libraries and most items on your list. He could also spend a few hundred million on lobbying politicians wherever Amazon operates to:

a) Make sure global corporations pay the proper tax rate on their profits, instead of making it easy to “offshore” profits thus giving them an enormous competitive advantage.
b) Stop implementing fiscal policies that favour global corporations and make it almost impossible for small, independent businesses to survive.

I would not ask Bezos to take on the task of giving us back our town centres single handedly, he’s not the only one responsible for destroying them, but those two gestures would be a start.