There is no magic advice even if your average is 90%.try to look for RA tole.If you publish papers, you will have higher chances. If the PhD is really important to you, look now for jobs (academia and outside) and try again in a year or two. If you believe your score would still blocking you, do another Master and try to get a higher score. What I would not do, is to keep insisting on applying while you believe you won't be accepted with your GPA.