Vegan, Vegatarian, Pescatarian, what to eat?

I was cleaning up dishes the other night i came to my cast iron skillet from the night before. I had cooked sausages for dinner & the pan was full of the nastiest greasy crap ever. I cleaned it out with a spatula & some paper towels and the cleaned & seasoned the pan as usual. As i thought about that nasty mess in the pan I thought about what it was leaving behind in my insides. I am thinking now about what my future
Of eating is going to be. As i write this I am almost 54 years old & i have not lived a terribly healthy life. I have recently given up died soda & it was pretty easy so giving up meat should be no problem.

I am giving up pork for sure, most likely all red meat. I am still going to eat fish for my protein & maybe chicken as well.