It really depends.

You can get a HELOC if there is equity in the property most likely, which there should be since you own it in cash, but you will just be decreasing your pay out and then may end up short in repair money, depending on how much it is worth.

Depending on how that conversation goes, post a 3 day for nonpayment. 

Not sure you really make more money.BRRRR would be interesting if you can find it.Flipping is competitive and brings in cash but not long term wealth.They all are great options, it just depends.

This completely depends on what you are looking for.

Depends on what you have to pay for your money, may not be worth it.

If you said the property was valued at $200k, then 2nd position may still bid in an attempt to run up the numbers depending on what kind of haircut they're looking at. 

Even as a Foregin National you can still take out up to 75% Cash out depending on your citizenship. 

Selling would likely mean taking on new loans at much higher rates, reducing your cash flow margin unless the new properties are stellar performers.Transaction Costs and Taxes: Selling could trigger capital gains taxes (depending on exemptions) and other selling costs, eating into your net proceeds.

How to go about this depends on which state you're in.