That's depressing! More people contributing excellent articles, and subscribing to Reading Rhombus might help.
You - and more readers - using the sharing tools that Medium offers, not just once, but multiple times over time - definitely helps. (Thank you for the reminder; I'll do that now, but it needs more than me doing it to reach a wide audience.)
Frankly, Medium is now a very saturated platform and poetry is a niche market. Huge readership goes to the trashy gossip, click-baity titles, misleading promise of wild riches...
But once you learn to be true to yourself and not read or write at the dictates of a fickle wind, it's like poetry. It changes you, as nothing else can.