Well, one possible plot could be a training arc where Goku helps Caulifla and Kale to master new forms. They could travel to different planets for special training. Goku could share his Saiyan knowledge with them, and together they face off against new powerful enemies.
A plot might involve a tournament where Goku teams up with Caulifla and Kale. They have to work together to defeat stronger opponents. During the tournament, there could be some friendly rivalries between them as well. For example, Caulifla might want to prove she's as strong as Goku in certain aspects. Kale could struggle with her berserker form but with Goku's guidance, she manages to control it better.