Renko charts (ATR 14 based) in Daily, 1hr, 30mion and 15min are solidly in the green. This could indicate an approx 80% chance that the market may continue to rise a bit tomorrow. Best not to trade in the index till after expiry.
RSI above 70 is no big deal. In the rise from 12th Jan to 30th Jan RSI was at or above 70 for 21 days!