stewardship
noun [ U ]
uk/ˈstjuːədʃɪp/ us/ˈstuːɚd-/someone's stewardship of something is the way in which they control or take care of it:
stewardship of sth We need to ensure our state to ensure good stewardship of resources.
under sb's stewardship The club has been fantastically successful under his stewardship.