I'm not a huge fan of paying cash since you lose liquidity. 

I plan to have $60k in liquid assets to be able to invest.

Not the first won't be the last.This will depress home prices as people liquidate their STR's in the area.

It's good to become an investor once you amass enough liquidity to run your project, get the title to the house, pay crews full salary, order materials, fix and wait until your property is sold without paying a penny in interest rates to HML.

That is something that people might come across, sometimes elderly sellers just want the liquidity as soon as possible.  

To do real private lending you'd need at least 500k liquid unless you just lay out all you have in every loan 1 at a time.Then there is Gap funding. 

This can also provide liquidity and steady income.6.

I currently have $100K in liquid funds and good credit with experience doing a handful of fix and flips and rent to rent medium term rentals.   

You'd want to have good FICO and enough liquidity.

I’m just not sure if my first REI should tie up my money in a long term asset (appreciation) vs investing in a quicker ROI (fix&flip, BRRRR, wholesale, or simply cashflow)The typical down payment in Denver metro for single family is around 80k (which I don’t have in liquidity).