Would something like this work in your two car garage?
https://www.wildfirelifts.com/double-wide-car-lift
It's more economical than building an addition to your existing garage and solves the problem of storage for two other cars. It would allow you to save your funds to continue to invest for retirement while keeping your toys as well.
I built a 40x60 steel building in late 2019/early 2020 right before material prices skyrocketed. If I attempted to build that same building now I couldn't afford it. Prices have to come down eventually, and I would recommend trying to hold out until that happened. I had the foresight at the time to build my building with 14' walls so that I could add a few of those wildfire lifts in the future if needed. I'm almost out of floor space now so I know I'll be needing at least one before too long!