it allows you to own an investment property that you purchase with financing options only available to owner occupants.

This maximizes my return over a Niche property.

What other methods should I use to acquire another property? 

Should I consider: Purchasing rental properties?

I can do title research on my own, I've dealt with property management companies, and I've dealt with all kinds of real estate related litigation (adverse possession, title defects, foreclosures, HOA disputes, evictions, to name a few).

In addition to STR'ing the main house, he is building 2 more units (ADUs) on the back side of the property.

Even if you aren't a property management company, you can still use platforms like AppFolio, Yardi, Buildium, and so on.Excel makes it too easy to forget something.

I have a great job that I love and currently do not need to spend the cash flow from the properties. 

I specialize in small multifamily properties and house hacking working alongside BiggerPockets podcast guest Andrew Freed to help investors find high-performing deals in Central MA.My Background:  - Started in late 2019 I utilized an FHA loan to get my first 3 family property in Fitchburg, spent about a year fixing it up and soon after I refinanced. 

He is older and does not have a mortgage and there is a lot of deferred maintenance on the property.