When he sold it was basically a wash, less the cash-flow collected.

If she pays, then your really out of luck and you have to sue her in court for breaking the lease and damages.In general, I don't take people to court once I have the property back as the attorney fees and the fact you RARELY collect on any judgements (15% of the time or less) eats any profit and wastes your time.

When looking back, that isn't an accurate way to do it for a variety of reasons, plus it is a hassle every time to do the math and collect.  

Tenant and Lease ManagementSimplify tenant payment workflows, digitize receipts, and efficiently manage leases, rent collection, and maintenance requests, etc.5.

Next, I'll be pivoting into subsidized housing investment and collecting rent $ from the government as i truly do believe this is a way to boost CoC return percentages in today's market.

These factors collectively contribute to a successful sale and maximize the property's value.

1) I always use zillow to list new properties and use there platform to accept zillow applications2) Doorloop for management that includes accounting, repository for documents like leases, collect rents, tenant communications3) Received lease agreement from a lawyer

I am considering other options to see if there are ways I can hire someone to just do showing only and mamage my own rent collection through Zillow app, I also have my own contactors to do maintenance but have been paying monthly fee to my property manager who has done literally nothing, they also never answered my calls.It definitely sounds like you need to reevaluate your relationship with your property manager.

Payment methods, tax collection etc.

He collected first/last/security payments prior to move in date and was never heard from again.