How can I improve my writing skills? Any solution, website, book, etc.

I’m really struggling with writing. Before basic writing classes were fine, but in college-level writing such as Writing 1 or English 1 it’s very different story. My first essay in writing 1 was B- and second one was C+…and I dropped that class. (The prof was not helpful at all as well as I wanted an A.) Choosing word is difficult for me; I always consider which word is more suitable for this sentence(context). Plus, writing concisely is hard. I’ve heard my essay is too wordy… :’(

Is there any solution for improving writing skills?
Also, recommend me any good books to read plz. I want to get some others’ writing styles.

Thank you.