Sorry to hear that you are one among the several old applicants waiting endlessly.
You may join the other threads for Warsaw office.
According to the posts in this forum and discussions about this matter, so far I don't see any favorable/positive answer indicating when the processing of backlogs finalized. There is no other alternative other than sending reminders to the visa offices. At least they will know that you are still waiting for their decision. This is just my opinion and see what others have to say.