I think
you should make a market research in order to find a better opportunity. As you've been working for this company for five years, I think now you have a good idea of what are the potential chances to improve your career.
I think that when we see we have a chance to improve our lives, why not taking the risk? All the times I had to make a risk decision, but I saw I had a good chance to go to a better place, I was successful. But it is also important that, when you decide to get out of your current job, you go nicely, because if something goes wrong you can go back.
SCEA 5 (part 1), SCBCD, SCWCD, SCJP, CLP, CLS