This is the most important thing, and generally I think everyone could be able (if they want) to improve diet, whether that is of less or no sugar, plant-based, less carbs, whatever.
Biggest problem is that you should try some diets in smaller portions over time. A one month experiment is mostly doable, that’s how I found out I was eating much more sugar than I thought. As in, I had to kick off a bit after a week of no added sugar.
Currently doing one month of plant based, and have to say it is actually really easy. Think I might stick to “home veganism”, so might only eat animal based products in restaurants or at friends if everything continues like this.
Think almost all people could benefit from an experiment like this, but start slow, like replace one product over time starting with standard breakfast or lunch and gradually move on. I rarely miss anything that I used to eat or drink in the past.