I eat the exact same thing almost every day. Every few weeks I'll make a minor change, like change a snack or have a different dinner.
Sometimes I switch it up because of time restraints (oatmeal instead of an omelet in the mornings if I'm running late). Or sometimes I'll just want something different for a day or two.
But for the most part I really really like my meals, they're easy to prepare & I get over 8 different varities of vegetables & 3-4 different fruits so I'm not missing out on much.
Are you eating foods seasoned to your loving? Do you like your veggie selection? Do you allow yourself a smidgen of your favorite "unclean" condiments? Basically, are your food choices based on what you, personally, like & not just foods from a standard diet?
The only other thing I can think to share is maybe start yourself your own cookbook. Include only recipes you've made before, that you know are NOT time consuming, fit into your macros for that mealtime, & that you absolutely love.
This is what I'm doing. It's a slow process to find meals that fit all those requirements (my time consuming, non macro fitting recipe book is overflowing

) that way when you're bored with lunch, just flip to your lunch section & make something else.
Well I hope that helps.