First of all prepare your mind, what is the maximum loss you can afford.
For your example, you have earned the premium of 196 points
Thus you are safe uptill 8400 on upside and 7700 downside on expiry basis (lets keep it in round numbers, 10-5 points plus or minus is ok)
So makeup your mind how much loss you can afford above 8400 or below 7700, and buy CE + PE of that much distance
Say if you think you can afford the loss of 200 pints, then buy a CE of 8600 and PE of 7500
Or if you think you can afford the loss of 100 pints, then buy a CE of 8500 and PE of 7600
You can adjust this distance as per your risk appetite. It will surely reduce your profit, but will keep you safe even in worst kind of gap up or gap down whipsaw movements
Traddatrend
Please suggest how to manage that's risk