Soy is OK for people of the blood types A, AB and B, but people of blood type O should consume it only occasionally.
Potato should be avoided by people of blood type A and O.
So, if you know your own blood type, use the blood type food lists to see what you should eat on a limited gluten free and milk free diet.
Choose only foods that are marked as B (Beneficial)
Like, Lam & beef and many kind of fish is Beneficial for Type O, but is an avoid for type A,
Those two blood types are the most common in the western world, and are opposites.
O is much more likely to react to grains and gluten than A.
O may become healthy on a meat diet (Keto, Paleo, low carbs), while A may become healthy on a Vegan (vegetarian, ...) diet.
If I were you, I would pick something like 5 or 10 foods from the list of the beneficial foods for my own blood type, and I would see if living on those foods for a few days gives result in less inflammation.
ALl you need is a slightest sign of improvement, to know that you should continue with the Blood Type Diet .
The best is, if you can, to stay away from the industrially processed foods and to try to make all your foods from the scratch.