I always recommend to continue working on the business in parallel with keeping an eye out for a cofounder. As you continue to move forward, it will become easier to get others interested and passionate about joining you.

Keep potential cofounders that you may have already met updated on progress, so that they can see you're not just someone with a good idea, you're driven to implement it too. As they see you continue to make progress they will become increasingly interested in joining and helping you, as they see the potential develop, and what's clear in your eyes becomes more clear in theirs.

Also, as you continue to build the startup, you will continue to iterate and validate it, and you'll get better at understanding and presenting to others its core exciting features / values, which will further help you pitch it to potential cofounders.

Best of luck, and feel free to let me know if you'd like to discuss this or any other aspects of your startup in more detail

Lee