Go to the sauna. Sweating works effectively for your immune system. You can also steam at home with dampo or herbs such as peppermint, eucalyptus, lemon, camomile and pine. Especially in the winter months this is nice and refreshing for your respiratory tract and skin.
Avoid antibiotics. Antibiotics can significantly suppress cytokines (messengers of the immune system). In addition, antibiotics kill the intestinal flora.
Avoid Teflon pans. These contain fluoride-containing substances. This would be bad for the immune system. Prefer ceramic pans. Also avoid the so-called 'plasticizers'. According to researchers, there would be a disinfectant in plastic drinking bottles and canned food, for example, which would have a negative effect on our immune system. You can opt for the safe 'stainless steel drinking bottles'.
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Finally
You can extract from the above information yourself what is important and feasible for you.
A nice side effect is that all the above tips also contribute to slowing down the aging process. And who doesn't want to look radiant and healthy right up to their old age ?!