H1B visa cap-exempt clarification

Hello, I am looking for a clarification with H1B visa cap-exempt category. My case : I was in H1B visa from 2006 to 2009, 2009 to 2012 and 2012 to 2015 with employer 1. I got my I140 approved with employer 1 with priority date on 2011. I switched employer on 2015 and got H1 extension till 2018, During 2017 time frame, I moved to H4 and then during 2020 I got divorce and I came to India. Currently I am in India and I have an employer willing to sponsor but he wants to know whether I will be eligible for cap-exempt H1B sponsorship. Since I have a I140 approved and also some H1B time I didn’t use between 2015 to 2018 timeframe (after first 6 years) will I be eligible for cap-exempt sponsorship?

Based on the info you provided, the new employer can file cap-exempt with extension of status under AC21 based on approved I-140.