Try OMAD (One Meal A Day) or a less restrictive variation of IF (Intermittent Fasting)
In your case i would go with IF, im sure you can handle a few hours of not eating unlike OMAD which usually requires extra tweaks or a burn in period.
Cut the sugar out and drink black coffee, get a cafetiere and drink ground coffee with it, cheapest better tasting coffee than instant usually.
I done IF and blew several sizes in 4 months bud
Also to anyone else here, dopamine is a key part in the motivation, cut out that which makes you worse, doomscrolling, news, social media ect
This can make you eat more to cope, less stress can mean more mental willpower.