Great question here! Always good to begin with the end in mind. When I bought my first house, I wish I had an exit strategy.
A couple of thoughts:
1. You mentioned you don't want to sell but are considering exit strategies? Typically, an exit strategy would be considering selling a property down the road. If you want to buy other properties, I would place that under a business strategy or business goal.
2. I think what are you asking for is help with an entry strategy into entering the landlord business of either short term or long term rentals. You can even do a house hack in your current home if that is doable for you. That won't cost you alot unless you do a basement build out or something of the sort. Many landlords start here. Since you newer to the business. I would suggest starting there.
3. I agree with @Nathan Gesner, I don't think borrowing money to borrow more money is a good idea. What people don't talk about is you will find yourself upside down very quickly if you don't have experience in real estate and have enough to cover the debt service. You can take the proceeds from house hacking to put into your next property if you wanted to.