Currently, hidden negative divergences are clearly visible on the chart.
Even though, the price has established a new high post-September 2020 however, RSI failed to establish a new high and its the first sign of loss of momentum.
Applying the Elliot wave theory
From march lows of 250 and recent highs of 760 - we can consider this as wave 1 Wave 2 - Usually corrects up to 61.% fibo levels which comes down to 450. However, 570 & 500 are also crucial levels to watch for any reversal signs.
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M&M saw a massive fall of over 7% today and made a low of 660.
640-650 is strong support since its 23.6% fibbo level... it is likely the stock will bounce from these levels to further test the 570-500 levels in future.