Caroline, I hope that this never happens but if you get infected with COVID-19 there is a high risk, given your age, that it will have a fatal outcome. What you do to strengthen your immune system will not change this.

That is why I suggest that you give careful attention to risk minimisation methods.

They are, quoting from you; "keep distance, wash hands, stay out of crowds, hand sanitizers, masks, etc ".

With care.