How would you invest that amount?
60
BTC is already priced to half a million Euro. Quite some money and Bitcoin still has plenty of room for growing.
So first of all, I would not put it into some custodian wallet promising whatever. Not your keys, not your money.
I'd think on a business I can start - whether is a business in crypto or not. Even buying one or more houses of apartments for renting is a business.
I'd spend some money and may hire a financial adviser. He may have ideas which didn't occur to me.
Of course, I'd still keep some Bitcoin as investment. Maybe invest in other things too. With such a wealth there are a lot of options to diversify, and by diversifying right I can always stay on profit.
Although 60
BTC is quite a wealth, I would not afford to retire only with that. I have to do something to make it make more money. And unless you are already quite old, you'll have to do the same.
Bitcoin rising could be an answer. But I wouldn't rely solely on that.