Where do you live, and where are your units? At those price points I'm assuming this is a more cash flow area like the rust belt, or other mid west geography. Is your $$$/mo CF a true CF, or is that your net right now without any maintenance coming up? Do you have a PM or is this your job now?
Overall I would personally consider how I can still grow with the freedom that I have focusing on my real estate. Consider offloading an underperformer, or a high equity property and getting better, larger or more assets. Do it very intentionally, not just for the sake of scaling up, but to get better quality or easier to manage properties that will replace lower quality or harder properties.
As far as financing, if you have real CF then it shouldn't be an issue. Try talking to local banks who want to do business with you. Also listen to them if it is difficult to get financing...they're telling you that your math may be off. I have a friend who is a banker locally, he's seen business bank numbers for 40 years...he know what makes a strong business client and when it is a weak business with some good years. If it is a good business with a hard to finance issue, he'll work with the loan team to figure out how to lend to them. He knows the loan will pay and they won't default because he knows they're solid.