Dive as much as possible
Travel the world
Gas Blending
Tech Diving
Photography
Work on a boat/Live aboard
Help out with people who want to dive or learn
Work in a LDS fiiling tanks/ servicing equipment etc.
Open my own shop one day down the road.
I do every single one of those things - except for the last one at this point. However none of those comprise my PAYING day job.
Get a good job earning enough money to to the things you list above!