H1B extension for my expired VISA that was approved and stamped in 2010 from India

hello Sir

My h1b visa is approved and got stamped in May 2010. But the visa was not renewed after the expiry as I left the employer. I did not travel to US during the VISA validity period due to health issues. Now I am in US with my spouse in H4 visa and not working.

Can anyone please let me know if I can file for h1b extension with the help of a sponsor in USA for my expired visa as i heard recently that extension can be applied even after expiry wthout cap limit if the VISA is approved within the previous 6 years. Please give me an advise on this.