Cash flow isn't as good as I thought it would be - How do I scale?

[Philip L.]

I've currently got 7 single family rental properties in Michigan (C/B Class areas)
Bought most of them needing updating/rehab - followed the BRRRR method
Estimated cash flow for each property is $400 to $600 a month 
I've tracked the expenses for each property very accuratly over the past two years and overall each property cashflows around $200
It's dissapointing but I would like to know how do people with 100+ houses scale this business model or do I need to pivit into multifamily?