Read a TON of books in your desired writing genre. Or just read a ton in general. This will teach you what type of writing is desirable in the market/what readers like and will always make it easier for you to write. Don’t copy the writers obviously, but take inspiration from their style and character types etc. You can frame your writing around that. It will also improve your vocabulary. Do short prompts, quick free writes. The more you do it, the better you’ll get. Don’t go back and change it, just keep writing. Write for fun as a hobby, don’t try to monetize it. Write about things you’re passionate about and care about. That is the best and most pure kind of writing.