Suppose you earned 60
BTC by working hard for 5 years and one day you decide now you don't want to work then what would you do with that amount?
How would you invest that amount? What will you do? Hold it dreaming the price will rise? Sell it and invest the fiat? or start a business? or retire? Any ideas?

Of course start a business. Maybe property or buy home and then rent it. I think make investment in something like house and other kinds of properties, will be good because it not much speculation in future and maybe less risk than other real thing investment.
but properties are still related to investments or often called real estate investments but unlike the ones that you mention where you are not hodling and you are not for selling the property which can cost less expensive later on due to competition but instead you are using the house or you are renting it others which is still going to be indemand . converting some of those btc would be a nice idea just to be safe from price declines .