For op's specific case, nothing the embassy can do because visa number is not available yet to op.
For interview backlogs in Accra USEM blame covid. You can take your grievances to the Secretary of State or POTUS all you want, the challenges at the Accra USEM won't disappear overnight. We can all hope someday things will get back to previous processing times pre-covid. But until then, it is what it is. Right now, I preach patience, patience, patience.