Recent studies have shown that diets high in ultraprocessed foods have associated health risks, so simple eggs, veggies, and lean protein like you're using now sound great!

One potential problem with simple foods (that I've made for myself in the past) is not having enough salt in my diet when sweating a lot. Remember your electrolytes!

Cold-water-soaked oats with some fruit can be a great way to get morning carbs, I think. (Shelled) sunflower seeds and nuts are tasty and reliable calories that can last a long time. Canned (or otherwise preserved) fish can be another, if you like that. I like tuna and whole-grain mustard and green onions in a pita, but I know 'tis not for everyone. They make canned chicken and turkey, too.

And simple foods don't have to be boring: Any number of herbs and spices can work well with uncooked meals. Search the web, experiment, make mistakes. Have fun!