For Amex Platinum Travel, it depends on the usage! If you can touch that sweet 4 lakh mark in an year, then you can get a lot of value out of it! Around 50-60k MR Points as well as 10k Taj voucher!
You can go upgrade your millenia to either Regalia/diners privilege if you are up for the reward points instead of cashback!
Also, magnus can be a preffered card considering the recent edge rewards conversion rate! C2C will be possible since you have good limit with Apay!
You can also consider LTF Cards such as AU Variants, IDFC Variants, IndusInd Legend, HSBC Platinum, Zomato White, etc!