Rich Dad Poor Dad, by Robert T.

Your best bet is to find a fixer upper whether its a 2, 3, or 4 plex and build some sweat equity and charge higher rents.

Did you have a poor experience? 

He has kept changing his account on Yelp and conducting very poor service, ripping off people, or taking money like my case.What should i do in this situation to get back my money?

People are leveraging poor deals and buying cars on 7 year loans!

Offsetting this slightly my wife's brother is renting a room from us at $300/month so that brings our expenses down to $3700 currently.My ultimate goal after reading "Set For LIfe" & "Rich Dad Poor Dad" is to eventually get this down to $2500/month, and then start saving money to invest in BRRRR.

My approach is more of a "poor mans" variation of this same strategy because I'm looking in less expensive "up and coming" areas, as well as still doing much of the rehab myself. 

Does anyone think the main issue can be higher interest rates will drive inflation up and devalue our cash making property a much more safer bet?

I bet you one of them has a few houses that they've purchased at previous duty stations and are currently renting. 

Most Realtors will want to make sure we refer our clients to the best possible vendors, because a crappy referral reflects poorly on us.