Definitely write your own meta from your own perspective! One of the things I think is awesome about the meta writing in Sherlock fandom, is how many different angles people are coming from, and all seeing different interesting things. Yeah, the narrative fragmented in S3, and wtf even was s4, but once I let go of the surface reading and my expectations, wow, it got interesting!! I also didn't do a ton of lit classes in school, I had never heard of character mirrors or queer coding, but it's been so interesting learning! That's why I call it "the new semester". (I also didn't study film making or lighting or visual composition or music, and fans have been writing meta about all those things too, from which I have learned so much!)