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There is, just put a sign outside your door or post an ad on Craigslist/Facebook/etc.

Although, I hope you have a good reason to think you are better at predicting probabilities of default than professional lenders with teams who do it day in and day out.

Many professional lenders face regulatory challenges that a small private lender might not face.

For example, a professional lender is likely to face greater scrutiny under the Civil Rights Act.

Lots of companies doing this for awhile. I'm not sure about the rates, but you can find them by googling "best ptp loans for investors" or something like that. https://www.prosper.com/ is one, for example.

Credit Union?

It's called a credit union.