He claims they are verifiable online and that I should be comfortable doing business over the phone and internet.

Get out of your comfort zone.

The only challenge when being a full time investor that depending on how much passive income you are generating from your investments that can slow you down in your growth or maybe you have enough to continue at a comfortable pace.

Once you feel comfortable, you can consider expanding your portfolio or venturing into value-add deals.I like to start with single family homes.

-Run the numbers for each deal to maximize profitable returns within your risk comfort level.The key is understand all the costs, and aim for a 20% ROI minimum in most cases.

Get out of your comfort zone.

@David Spangenthal They have an interesting business model for sure...and if it works for you and you are comfortable with it, then go for it.

Those are probably the biggest pieces, the rest is talking to other investors, surround yourself with these folks, build the relationships, run the numbers, get comfortable with the numbers, and start writing offers. 

Once you're comfortable, then you can dive into value-add opportunities or the BRRRR strategy.

You are already losing money on it so you should either cut your losses and sell or be comfortable losing money on a monthly basis with the expectation to make it up on the sale down the road (see you're in FL so you might need to wait a few years).