Smile
Quit job
Buy new bigger house
Buy a few material goods I’ve always wanted - nothing crazy, just a few things like nice furniture, a couple of pieces of jewellery.
Do things I want to do rather than work
Pay off family mortgages
Small anonymous acts of kindness. Seen too many people be miserable and struggle o et what are really small things.
Depending on amount - if it was huge megabucks I’d buy land. If it was billions I’d think about some social engineering
Go on holiday. We haven’t been on an abroad sunshine trip for years.