I know so many investors that have "x doors" that will always be a number greater than I am actually looking to achieve.

Please get in touch if you are a lender and can help me achieve these goals. 

Demonstrate value in your partnerships and what you want to achieve.

Every strategy will have pros and cons but it really just all depends on what you are trying to achieve with your investing. 

However if I do a BRRRR I can achieve infinite return by extracting all of my investment.

That's a great goal to have and very achievable.

The apartment complex (large unit counts with own maintenance staff) cannot even achieve that maintenance/cap ex.   

I feel this target can be achieved given recent cap rates sold in the area, and hundreds of thousands of dollars worth of renovations combined done by me the landlord (1 unit+exterior), and my amazing tenants who did gut renovations of their units.The general rule of thumb is to use 3 lenders for cash out refinance right?

With careful planning and strategic decisions, real estate can indeed be a powerful vehicle for creating a legacy and achieving financial independence.

Define your targets above, note your starting point and ask in this forum how to achieve.