Being a professional musician can be rough, especially when you’re in and out of jobs.  The thing to always remember is that being a professional musician is as much as a career choice as it is a lifestyle choice.  You must continue to hone your craft and improve in it. You also have to be tenacious and constantly apply for new jobs and audition for jobs.  This is the bigger picture and the process you have chosen as a musician.  A good way to be successful in what you do is to pick a particular niche and be very good at that niche. For example, if you play an array of instruments you may want to consider focusing in on that your best instrument.  This way you are more likely to do great in your audition.