A few thoughts to help you find "your" answer.
- perhaps you designed or came up with an MVP but didn't "build" it.
- you don't hire a cofounder. This is something extremely hard and will likely lead to arguments between the two of you.
- will you need investments? VCs and angels will rarely take into consideration solo founders.
- will you need ongoing development work or is it pretty much done (excluding bug fixes and minor enhancements)?
As general rule, in your situation, I'd recommend outsourcing development and putting testing the market (although hopefully you somehow already did since you defined an MVP).