write more, read good writing. emulate good writing. read books on writing? Stephen King's "on writing" is recommended all the time
For the longest time with my fiction I was just focusing on writing writing writing and reading about writing. I'd always loved to read, but surprisingly never really read that much in my target genre. When I started, it's like another gate of improvement was opened up: analyzing the beats and conflict points of successful books in my genre immediately helped me see what I was lacking in mine. And being exposed to the wording preferences and writing styles of other authors gave me so many "Aha!" moments when it comes to formulating enticing prose.
I'm still not a good fiction writer by any stretch of the imagination, but the improvement has been steady when coupling reading in my genre with more writing.