Basically the title, you need to use the skills you have now and be a productive member of society.
I don’t mean go back and show the wheel or try invent germ theory etc.
For example I’m a mechanic i think I could go back to the late 1800s and still fix and repair engines and steam engines.
Maybe even take that knowledge further back and work on the first industrial machines in the late 1700s but that’s about it.
Before the twentieth century killing the patient wasn’t a big deal, it was kind of expected. Robert Liston, the best (or at least fastest, which for surviving patients was what mattered) surgeon of the nineteenth century, once had a 300% death rate in one of his surgeries (he killed the patient, an assistant, and a spectator) and all the reaction he got was “well, it was a good attempt, try to do better next time”.
Just keep trying until you find a strain that kills less patients than the previous one. They would probably have died from gangrene anyway, so it’s not like you’re killing them, really, just changing the cause of death. 🤷♂️