It's good to know you did some research and got some ideas. There is no single trick that works for everyone.
For example, even if I get multiple electricity bills bi-monthly, I pay them in such a way, there is always a bill every month. So, almost half of the bills are paid one month and another half in another month. This method may not work if you are running a business where the customers expect instant payment and receipt.
A single bill vs multiple bills makes a huge difference. Single bill is tough to maximize rewards. Multiple small bills are each to make good money.
You already have good credit cards. Along with them, you might want to add RuPay platinum debit card that has offers on each Friday for a maximum of Rs.100 per month. One can easily get multiple debit cards (RuPay platinum).
