I feel your pain. I'm off bread so sandwiches are out, then I'm at loose ends about what to do for lunch.

I don't have access to a microwave, so my go-to meal is salad. To stop it from getting watery, I use whole grape/cherry tomatoes instead of a chopped up larger one. Not a fan of carrots or cucumbers, so I replace those with a medium sized apple and a handful of nuts or seeds - once in a while I'll switch this with quinoa. For protein I'll use 1/2 cup or so of chopped-up leftovers from last night's dinner: chicken breast, turkey sausages, etc. I keep the dressing in a separate container.

I normally eat every 3 hours, but this thing keeps me going for 5-6.

My lunch will included a salad, fruit ( either orange, apple or a fruit salad). I have access to a microwave so I also have a smart meal.
My snacks during the day include cut up veggies ( cucumber, bell peppers, carrots, cherry tomatoes) and hummus. I also do greek yogurt.
I hope this helps. I know I feel better when I pack my lunches and snacks for the day.
Have a great day.

i take for my lunch most days fruit and protein powder you just add your water or milk,nuts and other dried fruit,salad in a bowl with tuna or chicken,I dont really find fruit that filling so it is good to mix some protein with it as it keeps me fuller for longer and also crackers are another good one also .