Great question, and definitely a concern of mine too. For us, we use OPM (other peoples money) for purchasing properties in Philadelphia, and then try the BRRRR method to pull all the money back out and pay our investors. The tricky part for that specific financing strategy with be estimating the final ARV since the market and prices are so up in the air.
However, new opportunities will be popping up too. On the other hand, I'm excited for lower prices and more deals that I expect to pop up on the MLS due to inventory sitting there longer now because less buyers in the market. Our thoughts for those are to go the traditional 20% down financing when it makes sense, bring in a money partner who doesn't mind putting that 20% down, and then giving them equity / cashflow in the deal.
Hope this helps! Good luck