Welcome to BiggerPockets - lots of great resources here to work through!

From cash flow point, not sure if it would make much sense to invest 180k to have an income of may be 900$/ month (that is if we dont use loan).

They pay me good monthly cash flow and are paying off my mortgages, and I do them a solid once in a while and let them improve my homes the way they want.

If it is light, a dscr purchase would be a great option as it is typically 30 year fixed and around 7% give or take depending on cash flow, credit, and leverage. 

Hi -I've recently inherited (or what amounts to inherited) a small fix/flip & wholesaling business that consists of a website where users enter property, situation and contact details which populates jotform and through zapier feeds a CRM. 

Correct, and PMs incentives aren't directly aligned with yours, as they are just passing through bids.

We had a couple guests come through last year where the entire exchange was automated.  

This is because you have hired them to mind and manage your property.If you are self-managing, you want to be able to demonstrate that you are proactively looking after the safety and welfare of your guests and the property, through periodic, documented inspections. 

After all expenses we are cash flowing on our first property and we are hungry for more.

But in terms of cash flow I like this more than an EV charger or renovation.