Hi! I'm going to do a bit of a hodge podge of recs for you!
@spnfanficpond - The SPN fanfic pond is an awesome source of TONS of blogs that write for SPN and they have multiple posts of fic recs!
@mrswhozeewhatsis - Look, another Michelle! Michelle has her own writing along with being an AMAZING fic recommender. She often reblogs others works and there's something there for everyone!
@supernatural-imagine-oneshot - Okay, this blog hasn't been active in a long time but the stories here are all incredible. This blog in particular is a big reason for getting me into fanfic and wanting to write it.
@supernatural-jackles - I'll happily recommend Jen's entire catalogue for your Dean and Jensen loving heart. She's not around much these days but I never read a bad fic from her and she handled writing about hard topics wonderfully.
@torn-and-frayed - Just go and do yourself a favor and read Steph's series Send The Pain Below right now. This series was one of my first forays into reading RPF and hot damn it doesn't dissapoint.
@kittenofdoomage - Rhi is pretty much on AO3 now but you can get to her stuff there. This is where I discovered ABO and fell in love! Iron Heart made my apocalyptic story loving heart so very happy and still does!
@campingmonkey - Elaina writes for not only multiple fandoms including SPN but she makes gifs too! Single handedly has saved me when I'm looking for the perfect gif but can't find it in existence. She's got another blog too @acklesmallville for all your Jason Teague needs!
@beaujensen - Because we all need more gifs of Beau Arlen in our lives
@justjensenanddean - The reason I get distracted on my timeline and forget to write sometimes lol. They got gifs, pics, keep up to date with news, cons, etc. and reblog other Jensen stuff too so yeah, this is one of my favorite blogs.
@zepskies - Zep is my new addiction. There's SPN stuff along with other shows Jensen's been in like The Boys and Big Sky. She does canon, she does AU and her writing is just damn good (aka this is the kind of writer that makes me want to step up my game). And I love how responsive she is to literally every comment, reblog, ask, etc. She sets the bar high for the rest of us!
I hope that gives you some good stuff to dig into!