Thanks for your article and suggestions. To be published by The Conversation you must be currently employed as a researcher or academic with a university or university-affiliated research institution. PhD candidates under supervision by an academic can write for them. That leaves the rest of us out.
I have recently written an article about Polio and found that there are not many appropriate publications on Medium for a science history type article. I chose The Innovation but it is probably not the best fit.
It is not my usual subject matter (but pandemics make us think about strange things) so I was floundering as to what to do.