My advice is somewhat different than you might find from others and it is based on my own real life experiences. Instead of pursuing a field that you think has the most economic opportunity, first consider this; is there any sort of work that you would like to do that you would actually be happy to perform without pay? If you can train and find employment doing that "thing," therein you will discover one of the real keys to happiness (you might make plenty of money, but on the other hand, it might not be the top salaried position... however, I can predict for you true satisfaction). Now that might be a hard concept to "get your head around," but it is a mental exercise which will be beneficial to you for the rest of your life. Whatever "that" is, train to be the very best you can be... everything else will follow.