Hi 😀 So, my best advice is to keep on practicing. Try to write something everyday. Read a lot too. When I read stories, I always keep a notebook nearby to copy down new words/ or phrases that I like. You tend to retain them without even knowing it.
Also, try not to be too hard on yourself. Your writing today could seem amazing to you, and months later you’ll be cringing so hard the entire universe flashes before your eyes. I think that’s an inherent quality of all writers, but don’t take it to heart. Think of it this way: cringing is good because it means that you’ve improved.
I’m still unhappy with my writing. Most writers never are satisfied because their style is always changing. So, I guess what I’m trying to say is that it’s perfectly valid not to feel happy with your writing, but it doesn’t mean you can’t improve 🙂