Okay. Well I have also attempted thrice, and am going in on the 9th of this month for th 4th time. I believe, we need to find out the mistakes that we are unintentionally making while doing the writing exam. If you deviate from the topic, no matter how good you write, you won't be awarded a 7 or above. In my previous 3 attempts, I did not fulfill the needs of the essay which lead me to score 6.5, 6, 6.5 in writing. I later came to know that I had issues with my 1. Structure of body paragraphs, and 2. Response to the question asked.
Work on these key areas and see where else you may be lacking. Get some IELTS correction service, that helps too. Check (
https://www.ieltsanswers.com/contact-tutor.html) for correction service (the instructor's name is Mike). Get at least 4 of your task 2 evaluated by him.