A "combo" that worked for me was intermittent fasting - as porkyV2 said - but, instead of combining it with a Keto diet, I went for the Bulletproof Coffee. Basically I would have dinner about 7pm (8 tops), then no eating at all. In the morning I'd just take the coffee, then go on without eating anything until around 1pm (but, of course, drinking water at least). It helped me a lot.
If you haven't heard about it yet, you can check a little bit about it here: https://www.bulletproof.com/recipes/bulletproof-diet-recipes/bulletproof-coffee-recipe/
If you decide to try it, don't play for their rules (organic coffee, butter made from grass-feeded cows, etc). I used regular coffee (pod machine ones), MCT powder (no oil) and Ghee butter and worked really well. A friend of mine went a little bit over the edge (she fasted for about 24 hours two or three times, I can't go that long), but she lost 40 kg in a period of 6 months.