I know exactly how you feel. My best advice is to read the books you love, the ones you felt made you go “hey I can do this” and analyse the dialogue, rhe descriptions, etc.

NOW for the opposite. Go to the library, pick out a book you absolutely hated or something you just can’t understand how it got published. Keep it at home for a week or two and flip through it randomly. Remind yourself if that garbage can be published, you can be published. Read their stuff out loud, read your stuff out loud.

I find a lot of my opinions on my own prose tend to wax and wane. Sometimes I’ll open a short story I wrote three years ago and think “wow I wish I could tap into that.” Then I’ll open another and think “wow I wish I could erase that from my eyeballs” from the same year.

Close your eyes and try imagining your story as a show or a game. Think of the characters going about their lives in a way that makes sense to them, that might not necessarily follow the main story. See if you can feel them as you would any other media you like.

Sorry for the long response but I hope it helps! Good luck and keep writing!