.- Sold it for $915K after 5.5 years (received $442K at the closing)- Did 1031 exchange and bought 8 SFH in NE & AL worth of 1.6M (brings $4k/months income now) What made you interested in investing in this type of deal?

I should look at the expenses vs the income (rent collected) and not the selling price of the property. 

Secure that income stream with your other keepers.  

To boost income, consider mid-term rentals (travel nurses, corporate stays), renting by the room, or adding value with minor renovations.

At this point, I would recommend having a line of credit to cover these things so you don't have money sitting in the bank doing nothing when it could be put to work.I have 33 units, no debt except for mortgages, and excellent income.

The Tenant Class greatly impacts rental income stability and property maintenance/damage by tenants.Both Property Classand Tenant Class affect what type of contractors, handymen and property management companies will work on a property.If you buy & renovate a property in Class D area to Class A standards, what Tenant Class will rent it?

I have a template that I use that includes projected income and projected expenses and I run the calculation myself, but if you like ones that do it all for you in addition to what has been mentioned above AirDNA has one as well.

Just some backstory, I attempted to do this years ago but quickly realized my credit, income, and debt was terrible.

This has prompted me to look into a software to track income and expenses.

Investing in real estate is a great way to generate passive income and wealth if you are in a position to do so.