Hi @Angela Aybar,
First of all congrats on getting through the 2007 situation and coming out on the other side because a lot of people would've quit there. What is your real estate goal? Is it to have a portfolio of 1000 units? Is it to make $5000 or $10,000 a month in cash flow Is it to utilize depreciation and tax benefits to reduce your income? You gotta know this first.
If you want to make $5000-$10,000/Mo. in cashflow, I think you should stay the course because you have a good base. Find a partner with good credit to buy another property or 2. If you can find the deal and bring cash then all you need is someone that can sign on the loan. At that point you'll have a solid cash flowing portfolio and lenders (the right ones) will pay less attention to your credit and more attention to your successful portfolio.
If you want a portfolio of 1000 units, I think you should sell these 2 properties and get with a real estate syndication group looking at large multifamily (maybe in the midwest like @Vanessa Ivonne Hernandez suggested) and you can invest alongside them on the GP or LP side. You can turn your 4 units into 250 units relatively quickly.
Hope that helps and it looks like we are both from Newark so if I can help in any way please feel free to DM me.