на своем

on one's own

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phrase Rare #27,785
on one's own Usually followed by a masculine or neuter noun; the exact meaning depends on that noun, as in «на своем месте» (“in one’s own seat”).
RU: Он сидел на своем месте.
EN: He was sitting in his own seat.

На своем номере!

With his own number!

— Peculiarities of the National Hunt (1995)

Царь всегда на своем месте!

The tsar is always in his rightful place!

— Ivan Vasilyevich Changes His Profession (1973)

Да буду я на своем номере.

Yes, I’ll be using my own number.

— Peculiarities of the National Hunt (1995)

Ты на этой работе совсем не на своем месте, Петя.

You’re completely out of your element in this job, Petya.

— Text (2019)

На своем поле.

On home turf.

— Поле чудес (1989)