The key is "if you WANT another job." If you are content enough to sit in your current position and blame it on God's predestinating purposes, go right ahead.
I don't mean to be rude, but are you a fan of Joel Osteen by any chance? Or do you not acknowledge that sometimes God's predestinating purposes sometimes puts us in situations that might not make us exactly happy. I am quite sure Isaiah was not too thrilled to know that he would preach God's Word to his people and that the end result would be them hearing, but never hearing and ultimately God's judgment would reighn down on his countrymen and only a remnant would remain. I am quite sure, however, that just as God told Paul, that His grace was sufficient for him. For some, I am sure that God has willed to live very comfortable lives like we do in America (even our poor relative to the rest of the world). For some, I am sure that God has willed that they live very uncomfortable lives in persecution as did much of the early Church and as does many Christians today living outside of the United States. When Paul was in prison, I don't read where he tried to better himself. I read where he learned about the grace of God bringing contentment, joy, and opportunities to preach the Word. I have no doubt that prison was not Paul's favorite place in the world, but it certainly was where God wanted him at that time.