Read about cytokines/chemokines on selfhacked and use the recommended items to reduce them. That should do a lot to make things easier. It will not cure it, the only way to do that is as I previously mentioned. That and restoring the nervous system in your lungs which as it is has reduced the immune system control within your lungs making them prone to antibodies constructed against the food that you eat. That takes some doing BTW but it can be done. It requires a very big change to the whole nervous system. Doing that incorrectly can be damaging, I have seen it myself in someone I knew. https://selfhack.com/
NF-kB - Nuclear Factor kappa-light-chain-enhancer of activated B cells
IL-8 - Interleukin 8
Check which ones are altered in Asthma and then take appropriate supplements to reduce them. Green Tea (without milk) can be helpful, it is a strong antioxidant. Cordyceps can be effective. There is a long list of things which have antioxidant properties and which reduce cytokines they are listed on the selfhacked site under the appropriate cytokine.