If bitcoin has a consistent financial growth in that span of time and I don't lose interest in investing in bitcoin, I would probably use the profit that I'm going to get in my hodling to buy myself an apartment building and if not, maybe a vacant lot where I can use to build an apartment or even lease to businesses, that's the ultimate passive income in my opinion although tenants tend to have a delay in rents, the money is still good especially if you also live in your own apartment, you pay the mortgage for the apartment building and you're making money or if that's not enough, my last resort would be using the profit as capital for business or another investment venture, anything to make more passive income is probably my goal.