You have teachers, you know how to get in touch with them, do it through email, Approach them after writing about something you want feedback on, don't just say "I need help with writing". Have time to sit with your teachers as they go through your document, take notes during the revision process. Peer revision could also be a helpful way to improve your writing. Sometimes we think our thoughts are more coherent than they really are, having someone else look at your writing could help alert you to things you missed the first time around.