Cash out re-fi vs. home equity loan vs. home equity LOC

[Kelvin He]

Own 2 properties in Austin,TX.

House 1: $480K, $224K mortgage (4.5% interest)
House 2: $550K, $280K mortgage (3.5% interest)

Goal: Increase net worth (I'm 25 right now). I want to extract the equity I have to increase the IRR of the two properties and also use that equity to invest in other things (crypto, stocks, real estate, my business).

Considerations: Starting a car rental business, also have an e-commerce business that does run into cash-flow problems sometimes (that's why I thought the HELOC would be a possible good option)

What do you guys think would be the best way to leverage my equity?