Theres a lot of place online to list like apartments.com, facebook marketplace, realtor.com, trulia, rent.com.

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

Sadly, it’s sat on the market too long and I’m looking to get creative with bringing the attention of many buyers looking for a good deal on a property (online auction or something else with tons of attention??)

Check out other online guides available here: https://www.biggerpockets.com/guides3.

We currently have 105 units and are using a variety of excel, google docs/sheets/calendars, apartments.com (ads and rent collection), docusign and QuickBooks online (which we would like to keep). 

I would recommend first, finding and joining at least one if not more local real estate investor (REIA) meetup groups (look on Facebook or Meetup or just search online) and try to attend as many as you can to network with local folks doing all different avenues of investing.

Unfortunately, ESA (Emotional Support Animal) letters are tricky, especially with how easy they are to get online.

You can go to a local title company to run a quick title search for about $200 or you can do it yourself if your county records are online.

Build your knowledge base through books, podcasts, and online communities.

Anyway, I'm thinking maybe HF has more advantage for online bidding, as they could essentially create many virtual IDs and have a large pool of fund to leverage.