Oh man, I read the article, and I really identify with what you also say: I'm now in a position where I'm pretty good at my job, and my employer is keen to give me a permanent position.

And yet, whilst it's fun to be able to answer questions on the spot, regarding my area of expertise, I'm looking forward to learning more.

Now, I learnt a lot on this job, and it's very challenging on a daily basis, but it's becoming repetitive, and having talk to management, they could not tell me how they see me/my position evolving in the next 6 months/1 year/2 years. And that makes me longing for another job...