@Khail Towers First off congratulations on having $500k to invest! That is awesome! Second, standing up for what you believe is admirable, don't compromise!
The number one thing you should do is first invest in education. I am not saying you should go spend $25k on a weekend training course. Those are typically a waste of money, but there are some good ones out there. I would recommend Pace Morby's mentorship program SubTo. He is highly invested in his community and provides way more value than what it costs!
1) I would not recommend investing in syndications right now. With the interest rates right being very high and volatile it is probably not the best time to get into multi-family. However, if it is not leveraged then the interest rates don't matter so that could be a great investment.
2) I would not recommend investing in the stock market. You have no control and the risk is extremely high for the return. Additionally, there are no tax advantages or inflation kills your merger returns.
3) STRs are fantastic for return on investment (ROI). They can be a bit more hands-on but there are many full-service property management (PM) companies that can take care of you. I am starting a PM company, we are based out of Colorado. We will charge 10% for full-service management. Feel free to reach out to me if you want more information.
4) Buy a long-term rental property. I would not buy in California their taxes and regulations are the worst in the country! I also would not buy in New York for the same reasons. Midwest is great, Fl, NC, SC, TN, TX. These are all excellent states to look for property.
5) Partner up! Joint Ventures (JVs) are great. You don't have to leverage your money, you can leverage the knowledge and relationships of other people, especially since you have what so many investors are looking for, cash! My business partner and I are always interested in JVs, but we may not be a good fit for you, however, if you reach out I would be happy to talk to you and give you some more advice.
6) Look into buying a property that can be turned into a group home or some other government-subsidized program. You can get $600 per bed (not per room). For example, you could buy a 3-bedroom house, place 4 best in each room and rent the place out for $7,200. The downside is that this can be hard to manage so it is probably best to find a management company before you buy.
7) Buy some land and build tiny homes, geodomes, yurts, or tree houses. Then STR each of the sites. This can be an excellent way to generate massive amounts of income, however, you would need to put in a fair amount of research and planning to pull it off.
I hope this helps! Happy investing!
Garrett