He could sell off most of it and give away 99% of it and still be wealthier than 99.99% of the people on earth.
I'll bet that YOU are wealthier than 50-80% of the people on earth.
I know that I am, even though my income is entirely from Social Security and Veterans Disability pension. With the equity in my house, I'm probably worth $100K, which places me in the top 10% worldwide.
Lots of folks are richer than I, but that has no negative effect on me. I am richer than most of the planet, for which I am truly grateful.
In the immortal words of that great philosopher of Western Civilization, Roger Miller, "You can't roller skate in a buffalo herd, but you can be happy if you've a mind to!"