Viral gastroenteritis. Herpangina. How do you cope? We often get sick …

Viral gastroenteritis. Herpangina. How do you cope? We often get sick with this virus, vesicles on the tonsils don't disappear ??‍♀️ We've been sick for two weeks, we recover, but then we go out again, and it starts all over. How can I strengthen my immunity? I'm taking two weeks off, washing the nose with another treatment and it seems like it's okay. But still, is there anyone who has any life hacks for fighting viruses?