You haven’t participated in any contest yet as I can see you have no star. So it could be the reason behind not putting you in top contributors list( top contributors reflect to enough excellence to contribute, means to help others). So just participate in any monthly contest, show your excellence and get some star. And bam, you’re in the list.
Disclaimer: Theses are my opinion, but you should definitely reach to the @admin anyway.
@admin, theres a lot of communication delay over mail. Can any steps be taken for it? My snackdown query was answered after over 1 week when i mailed again