make waves in (someone's) sea

Translations
создавать волны в (чьём-то) море
He tends to make waves in his sea, causing unnecessary drama.
Он склонен создавать волны в своём море, вызывая ненужную драму.
Definitions
To disrupt or cause disturbance in someone's life, situation, or environment; to introduce change or trouble where things were previously calm or stable.