I work as a developer and currently in my department, we do not have any projects going on. Therefore my supervisor asked me to do some training on X. I personally like learning X. However I have been learning X for about few weeks and I started to feel bored and sick of X. I want to tell my supervisor about it and then change my training subject to Y, or Z, etc.
Basically, what I want to say is:
I am bored learning X for so long. Can I learn something else like Y or Z?
Of course, 'bored' looks really negative in a work environment, but I could not find better words for it.
I found these words but it looks negative as well:
fed up, tired, weary, exhausted, have had enough
What words can I use to describe 'bored' without sounding so negative?