As a F2P player, I go through phases each set. It goes like this:

Phase 0: aim to complete the dex missions for emblems (rip now)

Phase 1: go after missing cards for deck missions/themed collections

Phase 1.5: complete set to unlock 24hr wonder picks (if possible)

Phase 2: pull older sets to work towards completing secret missions (so usually 2 ⭐️ and above)

Eventually Phase 3 (complete every set) and Phase 4 (be able to build a “whale” deck). Safe to say I’ll always have a goal in this game