No need to pay anyone, you can do it yourself and there is no need to know mysterious technical techniques.

One of the great mysteries of STRs is all of those numbers can be correct depending on how you manage. 2 identical properties side by side can be wildly different revenues. 

The statements that it's all such a mystery is just IGNORANT.

I've done mystery shops and refinished furniture over the years to build up money.

Whether it would result in a noticeable revenue and occupancy is the mystery. 

If in doubt, do some mystery shopping and tour your property and your competition, after that you will know what to do..It is actually not easy to sell a property like this, even for a low price.

Do some mystery shopping.

In fact, when I took a First Time Home Buyer's class years ago, one of the speakers invited us to apply with them if we wanted to be a "mystery tenant applicant".There was recently a landlord in a nearby city who lost a 6-figure class action lawsuit because he had been discriminating against minorities.  

Mysterious buyer buys Eagle Mountain ghost town city in CA for 22.5M.

However, no attorney is actively verifying the legitimacy of the 25% interest, so that will remain a mystery for a bit.