Use 'ease out' to describe a slow, smooth transition rather than an abrupt one. He plans to ease out of his current job by training his replacement first.
Pro Tip 2/3
Lessening Involvement
Implies reducing involvement over time so there's minimal disruption. She eased out of the project as her expertise became less relevant.
Pro Tip 3/3
Tactful Exit
Suggests leaving a role or situation without conflict or attention. After the merger, the CEO eased out of the company quietly.