W2 Income +500k - What's the best real estate investing strategy for me to scale?

[Marie Copul]

I am an attorney.  I invest in real estate as a "side-hustle."  I've flipped 6-8 houses, made good profit on those, and just purchased my first 4-unit multi for mainly cost seg purposes/long-term appreciation.  My W2 income is very high (+$500k), excellent credit, but I hate my job and I want to leave within a year or two.  If you were in my shoes, what real estate strategy would you recommend for scaling quickly (but smartly) so that I can replace a good portion of the W2 income from real estate investing? Wouldn't mind becoming a millionaire from this as well....

Should I hire a few ppl to scale the house flipping hustle (marketing, lead acquisition..ect)?

Should I buy up as many cash flowing/appreciating properties for long term holds as possible to add doors to my portfolio (although, I haven't enjoyed being a landlord thus far...)?

Should I play harder and get into land development?  I'd be considered an accredited investor, should I get into syndications? 

Is there something else that I'm missing? A combination of these things? I am completely open to suggestions!