But, I am still working at my job, my credit score is around a 700 (which I consider ok, especially if I wanted to get an FHA loan), and I have plenty of money saved up for another property.

I'm from Minnesota so things might be different here but your annual property taxes seem incredibly low?

I have seen lenders requiring a 640 or better credit score lately.

My credit is at 650, due to an old collection and late student loans (-__-), FHA was perfect for me because of my low credit score. 

Few Specifics:-I own a small business which is affected by covid19-My credit score is above 750.- I had to use my father as a co-signer to get approved-I have a HELOC total of $150,000 (using my home and my rental)-Interest rate is between 3% -4%-If I transfer all of it, my monthly interest payment would be roughly for $440I know there is a chance they might not closed the line of credit, and in that case I would be losing that amount every month. 

This helps "get in the game" with limited capital and teaches you an incredible amount of real estate basics within a relatively short period of time.

You may have seen this article with new rules form some lenders: https://www.housingwire.com/articles/chase-now-requires-700-fico-score-20-down-payment-to-buy-a-home/I look forward to talking soon

Credit score is high 600's.

More than likely it will absolutely hurt you down the road - even though it won’t effect credit score it will still show up on your report.

I do also own the one acre lot next to my house now that's worth about $35,000.I make enough money it's just I have terrible credit score.On that last point, my scores are good (between low 700 to about 750), but the money isn't as high on my side.Should I do a HML, where he pays all related costs, and he can then refi in 1 - 2 years, and pay me off?