@Azita S. Marcus hit the nail on the head.
I moved to the Milwaukee area in 2017 and started investing in real estate. My first deal was in the Sherman Park area. I was drawn to the numbers of the deal, but I didn't realize how much work it would be to manage. I am thankful to say it wasn't as bad of an experience like what you had. I went on to buy a second duplex about 10 blocks west. It is crazy how different a few blocks can make for both property values, quality of tenants, rents, etc.
I now have narrowed my criteria to areas where the cash flow will be slightly less; however, the management headaches (vacancies, midnight calls, property damage, etc) will also be less. I too like @Marcus Auerbach decided to get my license because most agents don't understand investing.
I think you made a good choice to set the cash aside, take a breather, and regroup! A lot of 2019 for me was building systems and organizing so I can have future growth with less headaches.
Happy Holidays!