What you need is persistence. You should practice listening, speaking, reading and writing every day. IELTS vocabulary is not high, but many of them are biased. You should take time to recite words every day. In addition, we should do simulation questions, which are recommended by the teacher. I remember that all the students in the IELTS class I attended in the same year were in the same situation as you, with scores above 6.5 ~ Have confidence in yourself!