voluntarily
US /ˈvɑː.lən.ter.əl.i/
UK /ˈvɑː.lən.ter.əl.i/

1.
done, given, or undertaken of one's own free will.
:
•
She voluntarily offered to help with the project.
•
He voluntarily resigned from his position.
done, given, or undertaken of one's own free will.