As someone who has experienced similar feelings. (I average about 250k-300k lines of code a year)[Yes I know lines of code is a terrible measure of productivity, you don't need to @ me]
Take 1-2 months off to travel. If your management team isn't run by a bunch of morons this shouldn't be a big deal. You probably want to go somewhere and you should do it while you're still young. During this time, your team will probably get a bit better. The other plants can't grow if one is taking all the sunshine.
My other piece of advice is to find a new challenge. Start a new hobby and get the feeling of sucking at something again. If you want to stick to computers, there are a boundless number of topics that you can dig into. Only start a company if you feel like you can't imagine doing anything else with your time.
Take 1-2 months off to travel. If your management team isn't run by a bunch of morons this shouldn't be a big deal. You probably want to go somewhere and you should do it while you're still young. During this time, your team will probably get a bit better. The other plants can't grow if one is taking all the sunshine.
My other piece of advice is to find a new challenge. Start a new hobby and get the feeling of sucking at something again. If you want to stick to computers, there are a boundless number of topics that you can dig into. Only start a company if you feel like you can't imagine doing anything else with your time.