Once you get your systems down, you have a real estate business model that you can take to any market and be still be successful.

I would check into a few things to see what your best approach is.1) Find a great investor-friendly real estate agent (specifically one that knows STRs) to help navigate an area you may be looking in.

DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.

Is there a way to start your real estate portfolio or a business without having collateral or mixing personal finance’s?

I had to learn to establish relationships with people in the real estate investment field prior to purchasing and building.

Collaboration is the best part of real estate investing and I did not get this from using some AI-generated portal (currently running rampant in the forums).

Do you have any other real estate you can borrow against?

If you own real estate in your own account and are just building wealth to pass on to your heirs, it works great. 

I'm a real estate agent and investor. 

Your best opportunities are going to be unlisted properties that need some fixing up.Look at foreclosure, Estates, tax sales.