Leftovers, or how to use them is one of my favorite Quandries.
With a pork roast, I like stir fried rice ( be careful you don't make so much that this begat's it's own leftovers). Sliced hot roast sandwiches, with mash potatoes/ and gravy. You made gravy didn't you? Cold sliced sandwiches for lunch; Hash. with the last spoonful of gravy, some cooked and diced taters, onion, peppers or hot peppers, diced pork. Stir together, tamp it down flat in a slightly oiled pan and don't play with it until it gets crispy on one side, flip and finish.
I find beef pot roast, chicken and port butt more versatile than pork loin roasts for leftovers. These can be shredded as well as sliced and diced, and then can be used in more Mexican style dishes, Asian dishes etc. I like the consistency of diced and shredded more sometimes than sliced and diced. Mayber that's just me.
Salads are nice as a main meal, and you can use whatever sauce you think up, not just salad dressings.