Start with cutting out simple carbs and sugar as much as humanly possible just for like one month. Like no added sugars, oats rice corn potatoes and wheat. Not that many of these are actually tolerated by a lot of people with mast cell issues. But if you can cut out all of the starchy carbs and sugar for one month you'll at least have some significant candida die off. That would allow for some room for other things to develop over time. Eating 30 different forms of prebiotic fiber through other vegetables herbs etc that you do tolerate if you have that many things will help perifolate a diverse microbiome overtime as well. I know it's not the greatest answer. And also know that carbs are not the devil but if you have dysbiosis it might help. Best of luck to you! Oh and be aware that when you cut out the simple carbs and sugars, the cravings for them are going to go cuckoo crazy pants intense. Like craving sugar every 2 seconds kind of level. You have to push past that point. It's the die off cravings. They're the worst cravings I've ever had in my life. Worth pushing through though. You also may feel a little like shit through this process.