For my first teaching job I was hired by a large Texas suburban district to teach elementary music during the year when they couldn't find anyone else who wasn't already under contract. I accepted the position with the understanding of the then fine arts coordinator and the principal that the following year I would be allowed to move to a middle school band position when an opening occurred.
The following year 2 several openings appeared. I was passed over by the fine arts coordinator.
The next year 3: Same thing as I again got passed over in spite of what I was told by the fine arts coordinator when he hired me and in spite of receiving stellar evaluations at the elementary school. The principal was on my side as she truly did try to help me land one of the many middle school band positions when they opened.
But at the end of year 3 she (principal) quietly off-the-record told me that she believed that the fine arts coordinator was working to prevent me from moving out of the elementary position because during those 3 years except for a half-day kindergarten teacher, I was the only other adult male in the entire building and the coordinator wanted to keep me there especially since I was a male and I was doing a fine job there.
So for year 4 I found a middle school band position in another nearby large suburban district and was offered that position during the second week of August, well past the deadline to resign. But the elementary principal got in the last word as she released me from my contract and I finally was able to make the move to middle school band.
Do what you gotta do. I did and it worked out great for me.