Basic principles:
It could take some time to change the habits, gut microbiome and metabolism to the healthy and improved ones.
Assuming three meals a day in average there are 21 meals a week while one meal replacement requires 2 weeks for safe adaptation.
Replace one of 21 common meal to a healthy version, life with it for two weeks and move to the next replacement. So totally 42 weeks should be enough to build new habits.
Don't process food with high-temperature like a boiling or frying. During millions years of evolution the all animal species adapted to pure raw food. Involving high-temperature processing is controversial because
Do the right choice in the favor of fresh, raw and fermented food.
Let's find as many ingredient varieties as possible.
Imagine all annual menu composition optimally represented in each meal, then the body receives the stable stream of all required nutrients, without local troughs, peaks and misbalances.
Don't concentrate only a few ingredients in one meal, other few ones in another meal and so one.
The less amount of specific nutrient is contained in one meal - the better digestion efficiency reached.
As you gradually replace common foods with healthier options, the change will happen naturally. The old microbiome will shift, and you’ll no longer be addicted to any food. One meal a day may become sufficient, making intermittent fasting easy to achieve without extra effort, and even enabling longer fasting periods. This approach will definitely make your life easier during Ramadan restrictions.