He was used to being a big fish in a small pond, but now he had to navigate the challenges of a larger company.
She felt like a fish out of water in the new school, not knowing anyone or where to go.
Compared to the older students, they were just small fry in the school.
She was thrilled to have landed such a big catch as her new client.
He was always surrounded by pond scum, never able to find true friends.