I own pretty much everything I need/want (paid off house, car, etc).

So now I usually just work to pay bills and spending money, stashing away for a rainy day, etc. Most of it goes to taxes.

Given UBI, I probably wouldn't even need to bother.

I'd do it on the spot. My monthly spendings are already less than the min wage in my country. If everything else stays equal I'd gladly give up work for 75% of the min wage.