on one's own
The tsar is always in his rightful place!
— Ivan Vasilyevich Changes His Profession (1973)
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)
Он заработал много денег на своем маленьком бизнесе.
He made a lot of money from his small business.
Он почувствовал дождь на своем лице.
He felt the rain on his face.