The pause in publishing HITs was not our decision, and will hopefully be fixed soon.
We somehow got locked out of our account, so once it ran out of money (last Monday) that ended out ability to publish more HITs. We are in contact with Amazon support trying to get it sorted out, but every step of the way seems to involve a 24-48 hour wait for some action that may, or may not actually happen.
We have not moved on to another platform, and once we have our account sorted out there will be quite a few titles to catch up on.