I’ve recently become a member of the Online Writer’s Workshop.
Basically, it’s a place where writers review each other’s work.
It has been eye-opening in both directions. I have received reviews that tore apart my writing in all the right ways, giving me the input I need to improve. I’ve also read submissions by others and, by realizing what it is about their writing that I find amateur or weak, discovered weaknesses of my own.
There’s a trial membership, I believe, and it’s pretty inexpensive even if you become a member. Very much worth it.
Here’s the link if you’re interested: