Keep in mind you can get an atar lower than what is listed online and still get into the course. Atar is just about demand and supply. You can also transfer courses after a semester using your sem 1 marks. A uni WAM of about 65 is all you need for an 80 atar course. This applies to Usyd btw.
I think you will probs get over 80 though because atar compass tends to underestimate. I would suggest to focus on english though as that could bring you down. I had pretty similar marks to you and I got a little over 80.
Honestly, your marks so far are fine but do not slack off. You have like one month left so just work your hardest. I don't mean to be that guy but you are wasting your energy stressing about wether your marks will be good enough. Just work hard and you will be fine.
To improve your english marks, all you need to do is have a generic essay for each module that you can manipulate in the exam.
Also, DO NOT skimp on the short answer practice. They are your bread and butter. Learn how to get full marks every time.
You must also know your texts WELL. Look at video essays of nuanced ideas about it, read forums about it, pick it apart until you have thought of every theme there could possibly be.
Good luck