Wikipedia is a backlog, in and out – there's always plenty of work to do as an admin. This page documents the venues that often require admin attention.
Your best friend for finding work to do is the admin dashboard. Note that anything highlighted in red in the "immediate requests" table have priority - either due to its severity or that it is heavily backlogged. Many admins transclude this template {{admin dashboard}} in their userspace, providing it options to show only the venues and backlogs they specialize in.[1] See the template documentation for more information.