As everyone know option writing has become a popular thing there is very high interest for the same on expiry day. This is clearly reflected in the specific options strike and build up is clearly visible with fall in price
Its very important to understand the trend of the market from start of the day.
Its important to check if market is consolidating, trending, opened down/up etc.
This will help in understanding the force of the move. I prefer a breakout with the trend
So based on above 2 points I decide the level above which or below which I will take a trade. These 2 levels are decided by highest OI and Day low or day high.
Most important point the level should be broken post 2. And trade should also be initiated post that
Also imp. to understand that only 1 in 3 expires will be tradable. Risk reward will be significantly good. But you should buy a lottery ticket of the amount you can afford to lose