I have attempted to utilize traditional lenders however they will not loan on an investment property.

The videos I watched said that you can finance the property but it’s not the same as a traditional mortgage it’s kind of reverse and with a SDIRA property you need to put down like 50-80% and finance the rest because they’re most concerned with a large cash flow being generated to grow your investment and also to be there in case there’s any major repairs because those also have to come out of the account, you just can’t pay for a new roof for it out of pocket it has to come out of the SDIRA account.

This would then allow me to create a solo roth 401k and contribute a substantial amount more to it than just a traditional roth IRA.

Traditional FHA loan finance 3.5% down How did you add value to the deal?

After rehabilitating the property, you can refinance into a DSCR loan if traditional financing isn't an option for you.

Those doing best with ADU addition appraisals have an active role (flippers, developers, etc) and are adding them in areas that have traditional MF.  

It was my home but I’m buying a new home and want to make the most from it without doing traditional rental

I'm thinking of your traditional non-qm/business purpose loan types.  

Take a good look at your budget and explore different financing options, such as traditional loans, FHA loans, VA loans, and private financing.

As a college student traditional financing won’t work for me anymore as I already had to get my father to co-sign my 1st loan.