Everyone needs to find their own method. (We are not all the same.) But this would be my method in case you want to try ...
Eat only one meal a day in the evening. Make it a low carb one ... eg with lean meat or fish and veg. (But not cheese!) Or just veg. And maybe a probiotic plain small yoghurt (or 2) for dessert, or fruit. (If dessert is needed.)
In your situation, just mainly veg meals might be easier to prepare?
So how about a salad made from tinned veg (eg sweetcorn, kidney beans, greenbeans) or a plate of microwaved fresh veg. (Broccoli, cauliflower, sugarsnap peas or green runner beans?) Or a 2-3 egg omelette with some veg added?
Any veg dish can be vastly improved upon (taste-wise) by a generous potion of fat. Suggest an olive oil dressing made to your taste (eg olive oil mixed with salt/pepper or with sweet soya sauce and/or sesame oil or vinegar etc) to give it some flavour. (And the oil will make you feel more full?!)
Another simple meal could be some (unpeeled) baked pots (well cooked in a microwave so they end up well shrivelled and quite sweet tasting) served with tinned baked beans and/or a good dollop of butter.
Or an omlette with some added veg and maybe some bran if you need the fibre.
In the daytime, just plenty of fluids (ie tea or coffee galore - no sugar but milk is fine).
And if v hungry during day , snack on 1-2 (prepreared) boiled eggs or fresh fruit or veggie sticks .Or unsalted nuts/seeds. (But don't go mad with the nuts/seeds!)
As I say, this sort of eating pattern is not for everyone but it would work for me, as you are giving your body a good fast each day. And you will sleep OK if you have eaten before bedtime. The fluids will keep you going and hopefully keep you from constipation. (If not, add bran to meals/yogs!) The (good) fats and proteins will keep you feeling fuller longer. The lack of (any) added sugar and complex carbs will make you feel much more alert.
Keep busy in the day and try to take a walk outside if you have a break and you are able to. (Rather than just sit and snack.)
This type of food might sound not too great to start with, but you can really get used to this sort of diet. And then the flavours will become far more enjoyable. (Esp after cutting out the carbs/pure sugar and the junk.)
Good luck!