You should investigate non-conforming residential loans. Most local banks should be able to provide these. The terms will be less favorable but the requirements will be much easier too. I’ve always had W2 income so I’m not sure how they’ll look at your income but if there’s any loan option that you qualify for it will be a non-conforming loan.

The last one I did offered a 5 year term, 15 year amortization, and an extra point over typical residential interest rates. You could likely refinance into a conventional mortgage at the end of the 5 years if you have consistent income during that period. Down payment requirement was 25% or more.