I would say that flying to Brazil before Feb 15 would be a reasonable option. There is a double miles promo until then. And with your PLT bonus, one round trip will give you plenty of miles.

It will take slightly longer as the $785 or $810 fares come with a 2 night stay and the routing comes as SAN-DFW-MIA-SSA-REC-MIA-LAX-SAN - There are plenty of variations available. This gives you about 13,000 EQMs and 39,000 RDMs with the double miles and your PLT bonus.