I think you should find something that you really love to do like a hobby, sports, or religious and church activities. Being trapped in a job that is not challenging anymore is really stressful, so you got to find outlet for that. You should open up to your wife about what you feel about your job, and if you have close friends and relatives they might can give you wise suggestions too. And if you really decided to quit your job, remember that it is not the end of the world. For sure you have some other skills that yet to be develop or nourished and you have to discover that. You can also do your own business if you don't want to be an employee anymore. Even if you start a small business atleast you are the boss.