With 0 debts, PM said the tenants bought a new car, got promoted to a higher pay job, rented a new place -- can't blame those people who know how to play the system, for me, this might be a price I have to pay to learn.

Maybe they're contractually required to promote Plaid. 

I need to dig deeper and understand the value side as I know their value - bring the money and I want to promote the value add/ improvement and return for them

Even consider investing in a professional website, building an email list of potential buyers, and using social media to promote your deals.

I tried to promote ads to specific groups of people using various tag words.

If you mean to make your business standout from the others then a digital marketing services  like SEO, SMM, B2B marketing  and more will help you a lot more in terms of promoting your business .

However, netting $800,000 and recouping my $600,000 is enticing.    

So my solution was to utilize the zero interest direct deposit promotions from credit cards. 

Additionally you can get a better purchase price as its a cash deal(save maybe 10%) and you have 5 owners that can promote the property to their sphere to help fill the open dates. 

Google business listings, FYI, is the only such review aggregator with zero pay to play options, meaning there's no hiding bad reviews or promoting only good reviews on google (unlike, say, yelp, zillow, redfin, and everything else out there that I have ever encountered).