It sounds very nice, but it could be made minblowingly amazing with some tweaks. My thoughts are;
The kimchi omelette needs ketchup, chilli sauce, maybe some mushrooms, perhaps some pecorino and a load of tomato, cucumber and fresh spinach on the plate. Could also add onion/spring onion/frozen peas to it or fresh coriander, maybe some cooked potato if you feel a little hungry in the afternoon after the first time.
Carbs. Rice, potato, sweet potato. Rice is great for adding peas, edamame beans, sweetcorn, diced tomato...
Every meal is an opportunity to squeeze in a couple more vegetables, whether cooked or as salad. Even sausage, mash and gravy can have onion and mushrooms cooked and added to bisto, then some carrots and peas, etc. And tuna sweetcorn pasta is nice, but how about tuna, sweetcorn, chopped pepper, tomato, cucumber, red onion, olives, spring onion and lemon juice? Could you mix it up by using it as a jacket potato/sweet potato filling instead of pasta 3 times a week?
Where are your fats? Butter/olive oil? There's just a tiny amount in the avocado and any mayo. They help absorption of some vitamins and have nutrition in themselves. And they taste good. You don't have to eat them by the tonne, but they can make a potato taste great instead of just OK.
Can't fault the breakfast at all - you could add some kefir on it, maybe a spoonful of peanut butter if you wanted a slight change in flavours.
You deserve to treat yourself to beautiful, nutritious, tasty food that feeds your body, mind and soul. So if you can, go for as much pleasure from what you have as possible, rather than seeing it as a restriction.