My reco is that you become an agent to help you get the inside scoop. You can go see and sniff homes you think would be viable right away, and then "guestimate" what you think they would sell for. After you view 50-100 homes, you will get a feel for what you want, and what kind of offers are appropriate and "out there". Print some cards, go to some meetups, and start making friends. Even if you find someone who wants to do a deal, yet you don't feel comfortable doing it, you can farm it off and still make a few bucks while you learn.
Imo debt is only good if you can use it to get higher and better leverage elsewhere. And frankly, that is hard to do right now. Some people like many doors, and some like few but with depth. Everyone has their own quirks. The problem I see is that you are looking for guaranteed growth, but real estate investing is also speculative. Who knew COVID was going to shut down the world? But is it more speculative than stock market investing? I know people on BP who sold it all a few years ago and are only in T-bills right now.
Re gurus, they offer a version of what they did as education. That is really their model. Even Pace admits if you watch enough of his videos. He doesn't do deals himself anymore, he just helps those who have trouble who have paid him $8,000 for his "program".
Realistically, you already have data from your prior deal. Now evaluate it to make sure you don't make the same mistakes - if you can call them that. I call them learning experiences. That is the mindset - we learn fastest when we fail. Some fail and get stuck. Some fail and move on.
To get started in any of them, you buy something, then rework it for higher value, and sell "it". I.e. You buy a duplex, fix it up for traveling nurses or other corporate people, put it on Airbnb, learn about the fees, and see if it cash flows. Most tell me, in the STR space, many quickly realize it is NOT even close to passive. Maybe you convert to MTR because STR gets banned. Maybe you go for a long-term rental. Everyone is a little different. Heck, I am studying for my MLO license because I want higher knowledge and found I like the numbers side more.