@Sharan
A few words in general you not asked for, but is a tricky point and can lead very quick to failure. As I see others do follow this thread, it is meant as a neutral information and not pointed to anybody here. But may the one or the other one will keep it in mind and will not fall in that trap because of knowing about this post here.
It may is beginners luck, it may is not. If you look at your thoughts or analyze them from the psychological aspect, you do the right thing as you value your first trading success with a healthy distance. :thumb: This should keep you away from becoming to over confidence by the result itself. Many who had the experience you faced now at that and even very high levels started to make the mistake to think now that they are kings of the market and could only win. The door into the room of bad, coming experience was exactly at that moment opened, as they started to increase there risk, build on the thoughts of overconfident.
Coming to the question about when to exit an option trade?
Most simple answer: Set a target on the chart or set a target through % on the value from the option.
Example: Nifty future spot at 7965. Overall short term trend is down. You buy a put with a value of f.e 50 Rs. You now can decide the level on the chart and set your target f.e at 7900 or you set a price target on the option price with f.e 75 Rs. Here you decide by your self how many % profit you expect on the option and what risk tolerance you face in your personality. Targets on the chart can be set through S&R levels, analyzing trend channels or use other tools like math. If you set such targets and you are not able to watch the market during the day, you must know how to find out what price the option at those target level will have, other wise you are not able to place a limit order by your broker. If you do not know how to do that, you should go for a price target on the option price and place this price through a limit order by your broker into the market.
As bigger as your targets are, if now on the chart or on the price value of the option, as longer you may have to stay in the market with your trade. So you will be targeted from time decay and may even from vega. (Basic knowledge already mentioned here in this thread and in other threads).
Hope that brings you one step further in your option trading. Take care / Dan