No, sorry.
However, you can open a solo 401(k) as a small business person (your schedule C consulting job).
https://www.irs.gov/retirement-plans/retirement-plans-for-self-employed-people
(Note that you can't have a "gig" with a 401(k). You would have to be a W-2 employee. You might have left that job to work on your own, which is fine. As an independent contractor, you can't be part of some other employer's 401(k) plan because that is only for employees which you would not have been. But you can open your own 401(k). )
