Question for F2p players, What's your strategy to complete sets ?

I'm a slightly newer f2p and need 6 ex cards to complete GA . I only have 500 trade tokens and 500 packpoints to get 2 of these 6 cards . How do I get the others ? Wait for them to give trade tokens ? Or is there another way ? I dont wanna keep opening more older packs as I need to continue the newer sets asap. What's the strategy you use ?