My mortgage is 3% and my current heloc is prime minus 1/2.

You would need to find a property (or properties) with a value equal to or greater than your current property, less closing fees.

Currently have flips, wholesales, buy and holds under our belt.Let’s do this!!

I currently live in Austin, TX in a home that I’ll be renting out in the next month or two when I relocate to Nashville for work.

Mubarak, Depending on the size of your porfolio I'd do software demos for Appfolio, Rent Manager, and Rent Vine.I currently use Housters and Appfolio.

Let's say the house is currently worth $300k.

Renovating our first over-the-top STR currently that should be online early 2024.

I currently don't own a home so the second home mortgage wouldn't apply to me.

Too early to say whether the licensing and legislation/reform that's slowly being introduced across the country will clean up the perception but currently this is how many in the industry (particularly the ones you want to build relationships with) view the RE wholesale industry. 

You just need to have a current housing expense meaning you cannot be living rent free.