If I could use all three to have people or pets not die, I would totally do so - but that's not really fair because it's part of life, and things like cancer and disease I can't have an immediate impact on.
I would:
- work harder in my old 3D job
- eat dinner with my parents at the table everyday as a child, instead of always with my brothers in front of the TV
- visit my grandparents more often, especially when I was younger and living closer to both sets