OPT expiring mid-June. No job yet. Alternative ways to stay in the US w/o violating laws.

Hi, Graduated with Masters from UW. Working for a non e-verified startup as a volunteer as a web developer. Visa expires in mid-June. I wanted some clarity of what could be done to continue staying in the US and look for jobs legally. Some of the options that I thought: 1. A PhD 2. Another Masters 3. Online Masters

If you think there are other ways, I'd love for us to discuss. Thanks!