You have acquired skills that are worth 500k, so maybe you can translate that into an adjacent career path and leverage your existing skills?

Building our PM company has been the most rewarding experience of my career. 

Especially as just about every big name on BP has shared various stories of having done exactly that through the stages of there career. 

Your risk tolerance will dictate which type of property is most suitable for you.

However, I made the error early in my career of thinking I was generating way more cash than I thought I was. 

“Mitchel, you’re setting yourself up for success early—props to you for diving into multifamily while balancing school, baseball, and your upcoming career with EY.

I started my real estate career in my mid 30's, not that early, but I don't believe it's ever too late to make the moves necessary for you and your family.How much time do you have to invest in real estate?

I agree with @Jonathan Greene that the question is vague, so my advice will have to be as well.The short answer: MTRs are real estate, so just like all real estate, any place that can long-term-rent cash flow with increasing jobs/population can be a suitable site to purchase. 

Early in my investing career I wanted to cost seg my properties, but my accountant told me I was wasting my time because I was unable to use the full depreciation benefits I already had.  

With that being said, I wasn't an agent or property manager when I first started, but I did start out self managing because I'm local and because real estate investing became my passion and my career (I used to be a golf pro).