Build your immune system, hydrate , sleep and good nuitrition.
Avoid sugar, corn starch( hidden sugar) Maltodextrin ( hidden sugar) Corn syrup and all seed oils.
They get in you gut and the bad bacteria feast away. Little tidbit, those store yogurts are all sugar, read the label, if they use corn starch to thicken, your just feeding bad bacteria.
Check your medications, many suppress your immune system, then you go and get a vaccine and your immune system is hit again.
Eggs are one of the best foods, green leafys , Berries ( low glycemic index)
Fermented foods are good for your gut.
Butter, yes butter is good for your colon.
Be safe, and don't forget to wash, wash wash your hands.

all things in moderation and actually listen to body and NOT the Doctor

* Stop blaming doctors. without them we would still have polio & other diseases.

* This may come as a surprise, but every individual Jesus cured & raised from the dead eventually died from sickness & old age, including Lazarus.

Vitamin C, D3, zinc, quercetin.

Also open your windows occasionally to keep fresh air circulating through the home.