BankNifty-Bullish Garltey-Month-CD leg Downside-Possible?

By looking at month chart of banknifty, seems Point C of harmonic pattern Gartley has formed at 20575. If yes, then we are huge downmove possibilty till 10,000.
This may take 10-12 months to reach and form point D at 10,000 mark.
Pls remember, this is one of the possibility and the price movement in the coming days may validate/invalidate the given analysis.