Should I mover to another company?

As this has been sin respuesta for 5months i'm very interested to know what tu have decided on your own terms. Have tu stuck to your old job o found a new one?
As for your original pregunta there are many aspects that could be why tu have not been promoted o moved to a different department when tu have expressed interest. The most positive of these is that tu 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 más depressing aspect could be that tu are just not qualified enough (on paper) o your boss(es) think tu are just not capapble,
As a very up-front person, i always ask if there are any comments, tips o 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 oso, oso de in mind tu 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 tu can further your education in the company o learn new skills to give tu that boost into promotion.
Good Luck.

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