The problem with staying long in Nifty is the way it is moving, a gap up, grinding for few days, questioning your call of buying. And then again a Gap up and repeat.
The issue is the follow-through is missing. I guess this is the problem when you are at ATH zone. Everyday a new ATH creates so much psy pressure on new longs. May be a good pullback (200-300 points) will be good for Nifty.