Doubt regarding NIFTY P/E and P/B ratio levels for profit booking

It is a thumb rule that one may start profit booking when the NIFTY PE levels reach 24-25 and P/B levels reach 3.5-4.

Now If in a scenario (For Eg), if the NIFTY PE is 26 and P/B is 3 (Either one of the above two conditions satisfy, and the other doesn’t). So still should one start profit booking. or lets say the NIFTY PE is 23.5 and P/B has crossed 3.5 mark ?

I know historically this has worked quite well. I’m really not sure if this will continue to hold going ahead. No two market cycles are the same.

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