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Well cgtrader states that you can become authorized seller if you meet the following requirements:
"CGTrader grants this status to a seller who meets the following requirements: is a registered member of CGTrader, has published at least 10 products in the last 90 days, has received at least 10 customer ratings, 80% positive feedback over the past 12 months and possesses no more than 1 negative rating for 50 sold products."
If this is all true for you, then I would ask this question in the lower left corner of the page (cgtrader live chat)