[dghughes]

I'd say you're doing the only thing a person can.

You see many people speak of "boosting your immune system" but it's pure quackery. A person's immune system is many layers and types, a system, it's not a single thing that can be adjusted at will.

The way I see my immune system is a 100 liter tank of water. You can't overfill it but it can be low. At most it can only be 100 liters. Your immune system can only be as good as normal there's no turbo button to over-boost it.

[redwood]

Get enough sleep.

[dolguldur]

Yes. Pure speculation, but lack of sleep might have been a factor in relatively young doctors in Wuhan dying from the virus. And quantity of viral matter might also be an important factor.

[takeda]

Yes, this is often understated. Not enough sleep and stress makes our body not protect itself as well as it could.

[enchiridion]

Zinc + vitamin c