No co-founder. What should I do?

I think it really depends on the requirements that your project dictates compared to your ability to execute. If you have the skills necessary to execute your idea in a reasonable amount of time you might be fine. But chances are you will need additional help at some point and finding a good co-founder will be important.

That said, don't stop what you are doing just to find one and don't just settle for someone just to have a co-founder. Take your time and find the right person that will maximize your effort. You're basically marrying this person so their being a good fit for your project and someone you can work well with is critical.

I am in a similar situation and am personally trying to be patient and find the right person to join my adventure.

If all you can provide are ideas, goodluck finding a co-founder.

Being a sole founder is a terrible idea, but it's less terrible if you're the coder. You need the hustle and the hacking. You may have one or the other but you need both. I was just like you. Didn't find the right person, so I built the thing with some outside devs. And things just got worse from there. In startups as well as life, it takes a village.