If you know you want to get into STRs, find properties in your market or market of interest that are managed by Vacasa and Evolve that are underperforming and have guest feedback indicating the the customer service from the host was poor (as it usually is with the big national STR PMs), look up the owner's name on the county or city tax records, and cold call or text them. Say you are getting started co-hosting and will do it for free for the for 3-6 months. Do that until you get someone to bite.
It's going to take a lot of calls or texts to get a customer, but you'll get one eventually. And the second customer will be easier with the credibility and experience of having another. Work the W2, run a STR co-hosting business on the side, pile up money, buy a house hack, rinse and repeat.
Your biggest obstacle is that you are young and have no experience. Don't hide from that. Acknowledge it from the beginning of the conversation if you get an owner on the phone. You'll have to compensate for that with low prices and convincing them that you are young, hungry, and will not be outworked.
Two parting thoughts - your real estate and finance degrees are not going to help you. Don't call a property owner and tout that you have a degree and it qualifies you to manage their property. A person successful enough to have purchased multiple homes is not going to be impressed by your degree. They will, however, be impressed by the fact that you took the initiative to find an underperforming listing, looked up the tax records, and cold called them. Old rich guys love seeing young hungry, ambitious kids being gritty and scrappy. That's your unfair advantage here.
The second is that I don't love your tone toward the "boring 9-5" job. Get one that you are good at doing, don't hate, and have the correct perspective and attitude. You're going to have it longer than you think...even if everything breaks your way, it's a long game. Slow and steady still wins the race.
That was long. Sorry about that...feel free to reach out if you think that I can be a resource. I have nothing to sell and would be happy to help.