Advice on investment strategies to scale

[J.C. Martel]

I've been investing in real estate for over a decade, but never really gotten to the point of scale. I've owned 4 rentals, done ~10 flips, done BRRR and been a hard money lender. Never had a bad deal, always made quite a bit. I want to scale, but not sure how to develop my strategy.

I have a $200k HELOC and excellent credit worthiness and high income from my day job. I have property in Kansas and Massachusetts and have a Kansas realtor's license.

I’ve always been into single-families but now considering small multi-family. Never owned a short term rental. 

Any advice on what you would do in my shoes?