You could not die, which would be pretty valuable.
But come to think of it, you could also make tons of money. An ordinary educated person today knows way more about medicine than medieval doctors did. So your optimal career goal should probably be to become a court physician. You could become as rich as minor nobility doing this, and (most importantly) without having to take sides in power struggles.
SaS = Soaps and Sterilization. Hmmm, interesting, but seems like you'd have to violate your second rule ("no opinions"). Maybe if you could manage to out live most other folks into your late thirties and forties (steering clear of all sorts of bugs - water, food, and transmission-based) the marketing would be your very aliveness. People would have to solicit your counsel rather than you having to actively sell it.
But come to think of it, you could also make tons of money. An ordinary educated person today knows way more about medicine than medieval doctors did. So your optimal career goal should probably be to become a court physician. You could become as rich as minor nobility doing this, and (most importantly) without having to take sides in power struggles.