Concerning TDEE, Macrofactor has a way of having a continual accurate calculation of your individual TDEE. All that’s required is daily weigh-ins and logging everything you consume.
https://macrofactorapp.com/macrofactor/
If you didn’t want to do that , the snake diet guy has an easier way to maintain weight as well. there may be profanity in the video
My personal recommendation is Macrofactor
Have you tried low carb OMAD? Its easy to progress from that to rolling 42s, then 48s. Keeping processed carbs and sugar to a minimum makes it easier not to eat anything all day/for days. If you remove the carbs and stick to proteins, healthy fats and leafy greens/low carb veg, you will notice a difference in hunger. Also being in ketosis helps some people with mental health issues.
It can be done on carbs (I did it for a bit last year) but found it very hard to maintain with no real progress.
Good luck!