Quick response and a fair cash-for-keys offer is still the fastest and least expensive way to get someone out who isn't paying.

FHA ; first time home buyer w 3 % down; sellers offered sellers assistance; How did you add value to the deal?

Given your experience and strong financials, you have some solid options:Commercial or Portfolio Loan: These are tailored for investors and can help you avoid personal guarantees, especially since you have an LLC.BRRRR Loan (Buy, Rehab, Rent, Refinance, Repeat): Some lenders offer BRRRR-specific loans with funding for purchase and rehab, allowing you to refinance based on the new ARV once stabilized.HELOC or Cash-Out Refi on Current Rentals: Tap into the equity on your single-family rentals to secure funding for the 4-plex purchase and rehab without high origination fees.Each has pros depending on your cash flow goals and timeline.

Put up other collateral or increase your offer.

I have it for my own home and I love it but I can't figure out how to offer it to guests. 

These platforms do not get involved in the transaction beyond the connection, and so any liquidity options and investor may have are simply what that sponsor has or has not offered in that individual fund/deal.

We stopped wholesaling and ended up just networking better with wholesalers and putting more offers out to find better deals.The BRRRR process also has its challenges due to being out of state.

Then offer a bit below the new price.

@Chris Seveney offered great idea.

You’re on the right track—setting up separate LLCs for wholesaling and building can simplify things and offer liability protection, plus putting properties in their own LLCs keeps assets safer as you grow.