An important step towards getting hired for all the game testing jobs you want is to become a really a great video game tester - the star of the team, or at least co-star. Achieving that level of competency involves moving beyond the what - finding bugs - to the how. How, exactly does one uncover flaws in the game? Ultimately, most bugs will fall into two categories - either design and game play bugs, or code bugs.
Understanding that you aren't simply testing a video game, but rather, are testing software, will help a great deal in finding and isolating bugs to hand off to the developers to fix. There are universal principles to the discipline of testing software, and when applied to testing video games, understanding these fundamentals will skyrocket your bug count - and your salary. You will then find employers begging to hire you, and will have all the game testing jobs you could possibly want.