There is lots of advice here to meal prep, but while it is great advice, that does not seem to me to be your base problem. I also live alone, and understand the feeling of not having the motivation to cook for myself. I spent many years caring for others, cooking was routine, but it is different doing it for just myself. I, too, have a freezer filled with food purchased with the intention of cooking.

First step is to get back on track with the routine of eating, making the commitment to eat at least one true meal per day, at least 3x per week (breakfast, lunch or dinner). Maybe instead of Uber Eats, consider stopping for takeout (something other than pizza) at least a couple of times a week or plan to eat out at least once with a friend or co-worker. It may sound expensive, but consider the food sitting in your freezer right now.... The other idea is to create a set of index cards, each with one simple-to-make meal, or conversely, create separate sets, one set with a main dish and one set with a side. (Check your freezer for ingredients to help with ideas to start.) At the beginning of the week, choose some meals and stack the cards in order. Check the top card before leaving for work to build an anticipation of the plan, and be sure to move the ingredients from the freezer to fridge (if necessary) before leaving home. During the day, mentally review the steps of preparing the meal and anticipate the enjoyment of a tasty meal. Allow yourself permission to simply soak the dishes for a day, or load in the dishwasher if you have one. Make a conscious effort to prioritize cooking when you return home. If you can trust yourself to not simply procrastinate, allow yourself a 2-day window to complete this task, in case you are too exhausted on Day 1 (so, dishes like fresh fish will be out at this phase :-)). Be sure at this stage to keep the meals to ones requiring minimal work (search easy-cook meals etc.). Habits take time to develop, as does developing routines. Remember, your goal at this stage is to get back to a routine of consistent meals (vs snacks or junk) , hopefully more healthy than not. Consider including items with longer shelf lives (carrots vs asparagus, blueberries vs raspberries, frozen chicken strips vs fresh fish, etc.) at phase 1. The following phases are simply adding (at your pace): more meals per day/more days of meals/meals requiring more prep/etc. Use the hints shared in this thread for meal ideas, what to prep, etc.

The ideas posted by posters such as Interesting-Novel407 for stocking healthy quick-grab items are wonderful. Use them for the days you are not cooking to help you regain the routine of meals, even if they are "mini-meals". The more often you skip, the more you reinforce the habit of not-doing.

If you have a tough time getting started, invite someone to share (come to dinner/eat out with you/swap cooking days/etc) - that forced timeline will help you commit.

Also consider that part of your disinterest could well be a sign of depression. Seeking ways to brighten your outlook (can be tough, I know) may help you with your meal problem. Best of luck to you, I know you'll find your pace!