A few suggestions:
- attend meetups, but not just one. Create a longer term relationship with those you would consider for this role. The likelihood of meeting the co-founder who completes the successful startup formula at a meetup is quite low. You're more likely to find this person in your existing network since that co-founder will also need to be capable of surviving the harsh peaks and valleys of the startup's lifecycle, together with you. Weak relationships are harder to maintain throughout this journey. There are, of course, exceptions.
- Evaluate tools that would allow you to build your product yourself. You'll be surprised at how far you can go with the tools available to non-technical founders.
- Consider hiring someone. A strong hire would create a working relationship and may end up being the best fit for the co-founder role. You might even get by with this as the long term arrangement.
- Be charismatic and open minded. You've probably already met your future co-founder.