Mostly 2-3 trades on average, the reason for choosing Zerodha, it was cheapest when I joined them, providing reliable now platform, web and mobile based trading etc. Later I found some other brokers providing lesser rates, but could not see much difference as I only trade options that too not regularly. Moreover I am familiar with their trading platform now, so not risking changing the broker..
But if you do 5 trades on an average (buy and sell are 2 trades) you are paying a brokerage of 100 per day. That is, for 20 trading days R 2000. Insnt it.
I will suggest, Achiievers. Their brokerage is R 1499 for 3 months for unlimited cash and F&O trading, other statutory charges for options will be more or less similar to Zerodha. So you can save R 1500 per month on brokerage easily. But, their account opening charges are a bit higher R 750 in comparison to others. They also provide NOW trading platform (free of charge) for trading, so it wont be a problem for you. IMO, switching to Achiievers is a good option, if one trades in options.