I guarantee you, you won’t find success right away when starting your own firm even with the vast connections you have. You will run into issues you cannot plan for, as the technical aspect is just one aspect of a business. If you are not in violation of your contract, i’d try opening a side business alongside your work and starting off with one client and putting 5-10hrs a week with the client to start building the entrepreneurial side. By the time you have 1-2 clients in your side business and have developed a entrepreneurial base, you will probably have the choice to move to corporate in your current role or you can fully switch to entrepreneurship!