FRA-GRU/GIG - Seeking advice

Hello everyone, I would like to thank you in advance for your advice! I (1 PAX) am planning to fly to Brazil from 01.01.25 or 02.01.25 to 09.01.25 (+/- 2 days). Whether Rio or Sao Paulo (or another airport) doesn't really matter, as there are very cheap domestic tickets. I would like to fly (ideally) from Frankfurt in Business Class, but I am also flexible from any other European location like AMS, LIS, CDG, MAD (etc). I currently have about 153,939 Amex Membership Rewards points (German Amex…