- Invite the new owner if they are not a member yet.
- In Account and settings > Workspaces, change their role to Owner.
- Now there are two owners. You can leave, or the new owner can change your role.
Billing note: the plan stays with the workspace. If the person who paid leaves, the new owner can manage it from Billing and credits > Manage subscription, but the card on file stays the same until it is updated there.