You already have Sun Warriors but lack support.
Prioritize Kyoshi Warriors or Fire Nation Cadets.
A wide board and a finishing attack. Do not keep a hand full of team boosts and no cheap creatures. A creature made during combat is not automatically attacking.
You have Sun Warriors and can use the interaction.
Consider Wandering Musicians for the next useful piece.
Attack with both and other creatures. Musicians pumps the team, while Sun Warriors supplies red mana you can spend on its token ability during combat.
The support is missing
Keep broadly useful creatures and answers; if the special reward is missing, build a complete deck before chasing it.