iPhone with trade-in/exchange. How would you do it?

I'm planning to buy a new iPhone. If I buy on Apple's website with trade-in for my used iPhone 13 Pro, I get almost 32k discounted. If I go through Croma or Reliance Digital, its much lesser I believe. What would be your strategy to buy this to maximise reward points and also exchange the existing phone?

For context, I've the ICICI EPM.