The "right" way may be to get a retirement visa now if you qualify as the 12 month extension plus a multi-enrty re-entry permit gets you unlimited entries during that 12 months and a new extension once a year.
You were not on "overstay" or did not miss your extension. You missed a 90 day report which is a minor misdemeanour in comparison resulting in a 2000B fine if you were 8 days or 8 months late in reporting.