I think, as someone who's done a lot of improving over the last few years, that there are two huge components to improving at writing - writing and reading. Read a ton (you already do this). Read widely (I bet you already do this too), at all levels of skill and style, across genre, particularly focusing on the kinds of things you'd like to write. And write write write write write. Write daily. Write even if you don't want to. Sign up for 750words (you get badges for writing streaks and other accomplishments!). Take breaks in the day and set a timer for five minutes and see what you can do with that time (you may find the answer to be "diddly squat". But you'll have learned something else about how you write). Write to prompts. Freewrite. Write write write.

And then comes revising and editing and honing craft. If that's the factor you feel is missing, there are some resources out there for you. The Killing Floor is still a great space and I hope lots of us will continue to use it, but if you'd like a venue with a wider range of folks participating, you might try critters. Looking at things critically - including your own stuff - is a skill, and practicing helps. :)

There's also this list of 50 free resources to improve your writing (some more useful than others, I suspect). Grammar Girl is a thing I check frequently myself. You don't need to have all the nuts and bolts down for a first draft, of course, but recognizing which screws may be a bit loose and what needs tightening for your second or third pass is handy.

And most importantly? *hugs* Keep having fun with it. Elimination stings. It's ok to feel kind of rotten for a while. Try not to be too down on yourself or your skills. I know that's easier said than done. Treat yourself to something nice, reread one of your favorite books, and look back over the HELLA impressive body of work you produced during your run in this season. It's pretty damn nifty. :)