Hi Leonard. I found this interesting and agree that we need to diversify, not just write for one place, such as Medium. I also write for HubPages where I earn some money, but my main income is as a freelance writer on Fiverr. I charge around 10 cents US per word, but have been freelancing there for six years. When I first started I only charged $5 for 200 words.
I find you need to write things you particularly enjoy in between what you write for clients, so that you don’t lose the joy of writing and it doesn’t become a chore.