Having worked both solo and with partners, I will never again run a business solo for an extended period of time. If the business is already profitable, I'll hire a competent GM-level person to help run it. If it isn't profitable enough to do that, then I'm going to spend a majority of my time recruiting someone for whom the company will be greater than the sum of its parts.
Having someone to talk to is huge. If they pick out a single one of your blindspots or bad points, that could make the business 20% more successful. Really, there's a long list of things that can go wrong in business. Tweaking and refining at any stage could easily give a 1%, 2%, 5% edge. Those stack up really fast.
Solo isn't so good. Partners are good. If profitable, you can hire some talented to take that role. If not profitable, I'd strongly encourage you to get over your... well, I was about to call it delusions of grandeur, but that isn't fair to say. For me, in the past I've fallen in love with my ideas, thought they were worth more than they were, and thought the execution would come fairly easily. I was delusional. Maybe you're not, but if you don't have money coming in and an obvious winner on your hands, you might rethink what the business is worth and go recruit someone. Have some sort of vesting or buyout provisions if it doesn't work and go get a cofounder.
I was the biggest pro-solo guy in the world previously, but I was mistaken. You got a high fever? Tough shit, it's just you running the business, make it work anyways. You ripped the cartilage in your knee and can't walk? Tough shit, hobble over the taxi stand, get a taxi to the bank, and limp/drag yourself in to do your business.
Having a team is good. If profitable, hire a GM-type, that'd work. If not strongly think about recruiting a cofounder.