In an interesting post today, Tobias Buckell noted how you can find a lot of advice for beginner writers online, but much less for mid-career writers. It's not because there aren't as many difficulties or questions about publishing for mid-career writers, but each writer has a slightly different career path, and what works for one writer might not work for another. And, unfortunately, a common response online to a mid-career writer who poses a professional quandary is "stop whining. I wish I had your problems."
So I'm going to step in the fray and give one piece of advice for writers whose careers have gone beyond the beginning stages. Find other writers who aren't beginners to talk to.
Writing can be lonely. Yeah, I have friends of all stripes who are kind and willing to listen to me (as I am willing to listen to them). But like lots of folks, I like to talk shop. And, as in every job out there, you can only really talk shop with people from the shop. The best thing I ever did for myself was to join groups of other writers whom I could talk shop with. Over the years, they've given me advice, perspective, and a heck of a lot of support.
So find other writers. Ones who know where you're at.
One caveat: Like all advice to mid-career writers, use mine only if it works for you.