Residential loans where borrowers do not need money but want the money (ie. they could have paid cash but want to have some leverage).AVOID:1.

If its four months from now, then explain to him he's going to be evicted, will have a record, and it will go to collections for all court costs and rent money owed, to the penny.

After that, the lender may use a private auctioneer to auction off the property and try to recoup as much money as possible.

Rents started to come down and I had to leave a lot more money in projects that I was in the middle of.  

I would look at buying 5 properties using loans that have some sort of value add aspect in a market that I believe will appreciate at the minimum of the historic national average.This may be a rather boring and unflashy answer but I believe it would be the best money spent in my current knowledge and expertise.  

To generalize broadly, most who call themselves private or hard money lenders (or any of the other euphemisms for the same thing) typically originate first-position or (rarely) second-position performing real estate loans.

My plan is to take the next six months to try and learn as much as possible about multifamily real estate, while also saving up money to be able to start a career in brokerage.

Do the cold calling yourself and that is where the true magic is as you can see with @Peter Tverdov success at doing it and getting a ton of money out of those conversations. 

But do look at the shiny penny and spend big sums of money to learn.

If you have 20k set a side keep in mind you may need to dip into that money if the seller won't deliver is POS complaint.