This might have something to do with KYT[1][2]. What was the source of your deposited funds? Have you used any mixers, took payments from people you don't really know?
If unusually large or unusual patterns of trades or any inexplicable or suspicious circumstances are observed, KuCoin may, in its discretion, place an administrative hold on or freeze your KuCoin Account
All my deposits comes from other exchanges binance and two biggest Turkish crypto exchange. And worth of my funds was lower than 2000$ at the time of suspension later i deposited more because i wasn't aware of suspension.