I'm a Tech guy in Linux Business, decided to go live with my own business. What product or service should I focus on?

I read a lot about start up and entrepreneurship. i'm willing to go every extra mile and to give all i can for starting my own business. I have a well good knowledge about Linux/Unix Systems - i learned for the last 15 years. I'm totally willing to start up, but currently I'm quite not sure about the product or service i should provide. i know it's a weird question, but in the product i see the essence of all, where i can stand behind and sell with conviction and belief. as well i have a good graphical eye and knowledge about WordPress, but currently its hard for me to get all my skills together and create a product and/or Service who sells good in switzerland. i am on the totally wrong way without the super idea about this, or i just search in the wrong direction? Thank you…