LLC (sole proprietorship) PA

I started a software product development company when I was in PA 10 years back. However, it never kicked off. I moved out of PA since then. I never got time to shut it down. I have been showing 0 revenue 0 expenses on my Schedule C. What is the right way to close the company? Can a company remain dormant and I continue to pay 0 revenue, 0 expenses in my Schedule C till I have a concrete plan to revive it? If you have a Sole Proprietorship LLC how do you manage? Is there any support group / website dedicated to be successful in this business structure?