Do what works but for many sweeteners trigger hunger and spike insulin. I lost 5 lbs when I kicked a heavy Diet Coke habit, no other changes.
Have you tried plain mineral water to see if it has the same effects w/o the sweeteners?
This study just came out recently. https://www.archyde.com/sweeteners-increase-the-appetite-in-women-and-obese-people-calorie-free-sweeteners-increase-the-desire-for-food/
Fasting is easier at higher BMIs and rolling 72s ARE easier as heavier people get fat adapted. Cole has talked a lot about other schedules and ideas as you get leaner, like one snack before bed, cold baths, etc. Good luck!