Been there, done that and got the t-shirt for it. One of the hardest thing is selling a dream & a promise to grow. And because we all have our own bad experiences alot of people tend to be scared away from this commitment. I think choosing a cofounder is sometimes harder than marriage, in essence it is probably a lifetime partnership but co founders and early stage teams are the most important part in starting your business.

Start by looking around you, start doing a background search for each person you think is a good potential to be your partner then go & pitch your idea to them with full enthusiasm to show them how much you care the more goals & relatable you are to their goals & current missions the better chance you will find the best suitable partner. Don't take anyone who will say yes, they gotta believe in the idea as much as you.

I wish I can help you if you can tell me more about what is your profile like & what kind of partner are you looking for. Wish you all the best and good luck for your project :)