Well i think you need pick a real world problem or need or an Idea and turn it into a product like Skype ( it solve voice problem over ip and people uses it mo

Well i think you need pick a real world problem or need or an Idea and turn it into a product like Skype ( it solve voice problem over ip and people uses it more than any other software) whatsapp, Airbnb, Uber, Twitter etc or build something which people love to use