There is no such thing as star alliance points. You have Miles+Bonus points with A3 and can redeem via their program within the rules and award chart of that program.
G3 is a partner of Copa which allows for redemption via their program but is not a partner of A3.
Your A3 partners available are Avianca (different divisions) to various places within Brazil and such nonstop destinations such as BOG, LIM. On CM to PTY & on TK to EZE.