This whole post has turned into a troll post, when I ONLY WANTED SERIOUS RESPONSES....
Allow me to be candid here. I'm not as nice as the others in this thread, but sometimes the truth needs to sting.
Your first post raised a lot of red flags. There are many "ratings chasers" on the network who want to get that next rating because they think it's cool. Your first post raised that suspicion because you are disappointed that your facility did not select you as an instructor and that was the sole cause for transfer. That is the telltale sign of a rating chaser.
All controllers that reach C1 are on the same level, and that includes those that have C3's back when they were awarded. ANY rating above C1/C3 is a temporary assignment that gives you special privileges on the network whether that be instructing, supervising, or admin. As other have said, it is a job to have those ratings not some mark of pedigree. An instructor has to double his VATSIM time or end up not controlling much at all because all of it is spent training new students. An instructor is subject to massive burnout after teaching the S1 rating material for the 500th time to a candidate that is not going to pursue the controlling side of the house. For every 30 S1 I put though as an instructor one or maybe two would reach the finish line as a C1. Talk about seeing return on your time investment.
So an instructor is a different breed, they have a great attitude, genuinely love the network, and want to see it and their student's succeed. They are not doing it just to click the I1 box on VRC.
So to be perfectly blunt. Maybe the reason you haven not been selected as an instructor is evidenced by your attitude to the very serious, helpful and cordial responses to your initial post. They are just not giving you the answer you want to hear. The best staff members and instructors are called to a position. The worst ones seek a position.