All of the listing agreements I've found online are between sellers and realtors, not investors. 

Looking at return on investment and cash flow of the property itself.

@Donte Brame there's the RI Real Estate Investor Group that meets twice monthly, usually the first Thursday of the month online for anyone, and the third Thursday in-person for members in Warwick.

Don't listen to your agent at all, go on rentometer, airDNA, and other websites to help you make an educated decision on how your property will rent.

Nearly a year ago I bought an existing two-bed, one-bath 1,440 sq ft ranch with a two-car garage on 1.4 acres that had fallen into disrepair.

A new build next to us has been on the market for a few months and hasn't sold.

I need some suggestions on high ROI STR markets in the USA.

Many people mistakenly think that bonus depreciation only applies to new properties or recent acquisitions, but you can indeed retroactively apply it to properties placed in service after September 27, 2017, thanks to the Tax Cuts and Jobs Act.The IRS allows you to catch up on missed depreciation without amending prior returns by filing Form 3115 (Application for Change in Accounting Method).

Does anyone have any recommendations for board games, apps or video games that “accidentally on purpose” teach these things as well?

They are excellent tenants who have taken care of my property very well and have paid rent on time every month since August 2022.