Ask HN: Should I find a business co-founder or learn marketing myself?

I have developed a SaaS product for devops after a user survey. I got 500-600 users to signup for invitation list. After sending them invitations, around 10% users signed up but didn't engage with the product, and didn't respond to feedback emails / widgets.

Now I am trying to find new users and have followed tips from various "How to get first X users" threads without much luck. I have a co-founder who has background in web marketing and sales, but he hasn't been much help with this.

Should I find a business co-founder who will be able to sell the product, or just tweak my signup process via iterations?