I recently purchased a primary home in LA County Sept 2023 (only put 5% to do renovations and have an interest rate of 7.25%; I rent out back unit when we are out of town and intend to rent out main house eventually).

You can charge up to but not more than what the local power company rate is in your area.

Hi, I set up a Solo 401k last year to start funding my investments in real estate.

You could start BRRRRing houses and maybe that would allow you to buy more and make more cash flow.As for the paying off the mortgages, I would make you minimum payments monthly and when rates go down in years, you could refinance but pay the same amount and that will help you to pay it off sooner while you are left in the same Cash flow position. 

You will get a low response rate like less than 1% but even a half percent gets you 15 phone calls and one of those can be a good deal.

My strategy is to buy and hold these properties, unfortunately I bought this one in January when rates were high.

It highlights that you are a new investor and local to the property.If you are a wholesaler, explain the process and show them what funds you will use to buy or hold the property. 99% won't do this.

Loans aren't just about interest rates.

It was both, but knowing how they treat property is also a good indication of character despite a poor credit rating

We (my wife and I) decided instead of buying a new home and renting our primary we would buy an investment property with the funds instead and just sit tight in our current home in the short term.