Hire a property manager.

Attend real estate seminars, workshops, and networking events to expand your knowledge and connect with industry professionals.

A lot of sellers are burned-out landlords who like the idea of "passive income"/mailbox money after years of chasing late rent payments, dealing with tenant BS and maintaining the property (I use quotes for "passive income" b/c no income is truly passive IMO, a wise seller will still pay attention to what's happening with the property in case they need to take it back, but collecting payments like a bank is generally easier than collecting them like a landlord, you can set up ACH with the buyer's bank or hire a loan processing company to handle it). 

Make sure if you do you're not hiring someone that isn't qualified.

Hire an attorney for an unlawful detainer and be done with it.

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

As far as if you still have to spray, I would recommend reaching out to a termite professional for incite on that, but if it was me, I would keep up it- since the home is clearly susceptible to termites.  

They didn't proofread it well (spelling error), and the wording at times seems less professional for what one would expect from a financial institution.

property is @ 550k Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Hire a lawyer and stop talking to non-paying, evicted tenants.