One interesting tooling idea might be, in whatever issue tracking system you use, to attach a TTL to assignments, so if the task doesn’t move to “done” (or “in testing” or whatever) by a certain point, the task reassigns to the original requestor/reporter.

The main reason this doesn’t work is because one of the biggest use cases for such tools is to formally promise that you’re going to do something (see, your bug report/feature request is in our backlog, you can track this ticket!) with no intention of ever actually doing it.