Your Solo 401k can sell and carry the note.  

Sell 5 keep the six free and clear.  

Take over the rent to own agreement from the existing tenants, or something else?

If you get that to them before the end of December then the new lease should begin 4/1/2025.

It's not the same thing.If you have $130,000 in equity, I would not use any more than $65,000 on a new property and $15,000 of that should be held for reserves so you would have $50,000 for downpayment and closing costs really.Unless your rental property is new construction, you don't want to max out the equity in case of large repairs coming.

A lender credit was disclosed on the Lock LE instead of being shown as the Seller credit.

Quote from @Matthew Holden: I invest through a company that does group loans to borrowers doing SFH rehabs and flips.

I would consider selling a property to pay off the credit card debt.Maybe your husband can manage the STR listings and potentially do the cleaning.Best of luck

The restrictions can be pretty brutal. 

(Google Fed Futures and click on the CME Group tracker).