Rewards on upcoming credit card bill payments (~5L)

Hi Folks, 

I have axis & SBI DCs and have to pay credit card bills worth 50k on HDFC CC, 1.2 L on Amazon ICICI CC, 3.1 L on Indusind CC. 

until now have been using SBI DC + PayZapp which gives .25% rewards. It does not support ICICI anymore and will have to check if it supports IndusInd. 

Are there any other worthwhile (& currently working) way using which I can increase reward points. If you think getting a new DC  will help, I can do that too. 

I agree that there are threads but its very confusing and I am not able to find out optimal approach for my problem so asking. 

Thanks