I like to sell options against big moves and way OTM and I like to get the top tick or close to it for the day.
My scheme works OK. On NVDA today (3/24/2022) I got a call off at 1.60 which was top tick for a while until someone sold at 1.66. (4/14 340 Call)
My method as shown in the picture uses an arbitrary Vol Expansion of 15% and an estimated top price of the stock off the chart which works OK.
I know the best way to try and figure the top price is by using vega but I don't know how to estimate the implied
volatility that the option would be if the stock got to the projected price to apply to the current option price at the current stock price.
Any help would be appreciated.
you can try implementing a local volatility model. There are many models around.
The one in the link uses Dupire's formula and (compared to others) is relatively simple.
https://financetrainingcourse.com/education/building-implied-local-volatility-surfaces-excel/