Your remaining membership credit is regular membership, which is likely what you had left before you bought premier membership last year. Your regular membership pauses while you have premier membership, and resumes once the premier expires.
Currently, your badge under your avatar shows you're a regular member; if you were still a premier member, it'd look like this:
Blackwing has covered it but I just wanted to add Gold Premier is only available in Dec/Jan (give or take a few days), So your year of Gold activated whenever you purchased it (maybe 19 Jan last year), & since that year has now finished, your regular membership has resumed.
Gold member for this year is currently available, but it will only be available for another week or 2.