The $PLTR weekly chart is exactly what you would expect from a price action rejecting at the Wave B level and moving down Wave C now.
The RSI and MACD painting clear pictures now of the downward trend and are not showing that support is looking likely soon here.
The 0.618 Fib and the 50 WMA are both at $51 right now, I would expect a move down to this level for Wave C.