Nifty is currently sitting on the support of 38.2% fib level and it is a good support for the index.
This is the third time the support is being tested. If there is a break down of the levels 50% anf 61.8% levels can be tested on the expiry day.
Major support levels :- 21420, 21300
If there is a flat or gap up opening wait for the bearish price action as market is in bullish trend on daily time frame.
Bullish trades only above 21585 with a targets of 21690 and 21830.
Wait for the price action near the levels before entering the market.