I know, I know, sandwiches might seem basic bring it up a notch by buying (or making in my case)
1- good ass bread like a good artisanal sourdough or foccacia,
2- Make a salad, don't just put lettuce, mix different greens together
3- Add pesto, buy it or make it, it's up to you
4- Good ass cheese, I'm talking a gooddd fresh mozzarella ball cut into slices
5- Protein of your choice. My go to is chicken cutlet but simple mortadella or prosciutto will get the job done
6- Whatever else you want, that's the fun of making sandwiches, no rule just vibes.