honestly intrigued on the potential unknown depths of the human immune system

how could it be strengthened, beyond just vaccines? what factors collectively affect the function that we dont know about? though i feel if the strength becomes too strong it might cause misfires, autoimmune conditions. delicate balance much be preserved. its no use having an enhanced immune system if you have to supress it to live well

maybe we cant enhance it? i would be ok with that answer too.