I have completed my undergraduate with a major in mathematics, however I was unable to properly apply myself for a variety of personal and medical reasons, and so was unable to achieve a suitable GPA to be accepted by any Masters Degree in Australia. However, I have not let my study lapse and have been applying myself, particularly to Analytic Number Theory (I've been through and completed the exercises of Apostol and am currently up to chapter 14 in Iwaniec and Kowalski) and Additive Combinatorics (Tao and Vu), and wish, if possible, to pursue further study with the goal of a PhD. Given my circumstances, are there any avenues that I should explore, or is this a pipe dream, and should I instead be more pragmatic and give up? I am aware, of course, that mathematics can be pursued as a hobby, but given my passion for it and improved medical and personal circumstances, I would wish to give it a try.
Apologies if this is not the proper forum to pose this question.