Should I verplaats to another company?

As this has been onbeantwoord for 5months i'm very interested to know what u have decided on your own terms. Have u stuck to your old job of found a new one?
As for your original vraag there are many aspects that could be why u have not been promoted of moved to a different department when u have expressed interest. The most positive of these is that u are just too good at your job. Many companies see their work as pieces of a clock, when things are working just fine and as it should, they like to leave things as they are.
The other meer depressing aspect could be that u are just not qualified enough (on paper) of your boss(es) think u are just not capapble,
As a very up-front person, i always ask if there are any comments, tips of even some concerns from my employer about my performance every so often. When i started my new job that was monthly, which has now been changed to 6monthly if yearly as i have been with my company for 4years now. That gives my employer a chance to pick up on my best and worst and also gives me insight to what i can improve on.
There is no risk in asking for an assessment, it shows your are serious about your work productivity but beer in mind u must take what they say seriously and if any areas do need improving take steps to actually improve them .
It could also be worth talking to whoever is in charge of training in your office/department to see if u can further your education in the company of learn new skills to give u that boost into promotion.
Good Luck.

Ask .
Why u was overlooked.
The worst they will brand u.
U r worthy.
But do your own homework.
Go see the spin in the web.
Best approach to survive and understand.
But stay calm. Always.
Good luck.