Ask people what they'd do with a sudden fortune and the answers come back strangely small. Pay off the car. Fix the roof properly instead of patching it again. Take the whole family somewhere once.
The yacht is a stock image. Almost nobody actually wants it. What people want is the lifting of one specific weight they've carried so long they've stopped calling it a weight.
Improvement beyond your dreams may be a lower bar than it sounds, because the dreams are honest, and closer than you'd think.