Turning investing into a business

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I'm curious to hear from those who moved from investing to what they would now view a business. What were the steps you took, hurdles to overcome, new mindset/strategies, etc? For example, mixing in flips, focus on the BRRRR method, targeting larger buildings, etc.

Similarly, what would you deem the next step forward for someone who has focused solely on buy and hold single families?  What types of projects did you begin to focus on after getting your feet wet with some of the more simple deals?

Thanks in advance.