Hi Carolyn,
First of all, I wish you a relaxing weekend :)
Well, in your case as a mystery writer you have something to sell! You could take your subscribers from Medium and grow an audience on Substack.
There are several fiction writers on Medium who earn $500 per month with their Substack newsletter.
Would this be an idea?
Who knows what the future brings. It depends on your big goal. Do you know it?
Mybe an ebook with your fiction stories? Maybe even a book on Amazon? Maybe opening your own (online) book shop.
Another idea for you: https://medium.com/online-writing-101/vocals-first-short-fiction-contest-with-125k-in-cash-prizes-1de015e676b2
On Vocal is a competition for fiction writers.
All the best,
Kristina