Ask HN: Where do I find a new petitioner for my H1-B if I have a I 797 approval?

Hi, In 2015, I got through the H1-B lottery but during my H1-B interview, the interviewer gave me a 221g slip asking more documents from the petitioner. It has been more than 2 months but the petitioner has not submitted those documents. And as such I want to look for a new employer. Where do I start?

Thanking in anticipation!