If you need 57.570 points, you need to spend at least 23.028 BRL without taxes or around 5800 dollars

Since there are 9 weeks left for this year, that means you’d have to spend 2.558 BRL / 640 USD per week. Let’s say the average price of a one-way flight within Brasil is around 650 BRL / 160 USD

That means you either have to travel a lot each week or book an expensive brand (Plus or Top) with a shorter advance purchase

As for you second question, the counter resets to zero at January 1st

Good luck!