Huge long wicks in candlestick chart usually means the central bankers are manipulating the cryptocurrency market by hunting people stop loss that they placed in famous crypto exchanges.
https://www.youtube.com/watch?v=yjJm74WzaX4huge wicks
in otherwise stable price action is a sign of manipulation. it means stops and margin calls are being hunted without an organic price trend behind the moves.
there are times when it's completely normal though, like blow-off tops and capitulation bottoms. a large selloff where the selling gets absorbed and bought up by bulls can result in a long wick.