Automation when a public comment is added

We have a workflow where newly created ideas are submitted in a 'New' status. If the idea is unclear we update the statis to 'Need More Information" and we expect the submitter to provide additional information through public comments on the idea portal.

At this state it becomes complicated for us to monitor if the idea has been commented.

We could potentially solve this by having a field 'last public comment by' and through a report monitor for ideas with status Need more information and where the last public comment by is the same as the submitter but what would be really great would be if we could build an automation that says: if the status is 'need more information' and a public comment is added then update the status to new.