Finishing with only 2 papers (both co-authorship)
One suggestion I can provide is to try and make it to a, related to what you're interested in doing for a post-doc, conference and network. Hopefully present some good work and meet PI's you might be interested in working with, you're far more likely to get an interview or offer if they have a face to put with the application.

If it's too late for a conference, you could and should try to leverage your advisors connections. A good letter of recommendation / Introduction can go a lot further than an lengthy CV, especially if your advisor is known and respected in the field.

I personally used the first method when applying to a postdoc. Having met my eventual post-doc advisor at conferences. When I was applying I had 3 not first author papers and two in preparation first authors (which languished on my PhD advisors desk 2-3 years after I graduated).