I have a multi family building with several tenants per floor and one tenant put out by the door their garbage Foods pizza box, and neighbors are complaining about the smell. 

Pretty large group, good speakers and free food.

Old food left out, all cabinets opened, clothes emptied from the closet.

I always take the cash and upgrade the appliances.I've had bathroom fans, food disposals, washers, dryers, microwaves and a furnace replaced.

I live in the large master bedroom with my own closet and bathroom and really only see my tenants when I cook food.

You might be caught off guard depending on the property floorplan if you switch out the carpet to laminate or vinyl plank and start getting noise complaints, just food for thought.  

Not worrying about putting food on the table, or healthcare for your family, or having to go fight in a war to save your homeland, but rather someone innocently called you "hon". 

E.g vending machine (luxury food/drink items etc).

You could drive for uber, deliver food with doordash, get a dog-walking business, wholesale properties, get a job as a home-based caller or IT tech, and so many more things to increase earnings.To summarize, I recommend you focus on increasing earnings, paying off the debt, and then investing from a position of financial strength.

In the downturn lots of crews were working just to have food on the table (cost plus a small percentage).