Sell, pay your taxes call it quits.
why would you he quit bitcoin its still rising its like he has a property in a tourism area.keeps rising all the time
May be he would not like to take more risk now as he has make a huge amount of money and should sustain easily for the next few years and may be what OP can do is withdraw 50 % of the money to be on safer side and invest the rest in other coins to get returns.
Surely OP didn't expected what's happening now in his life like it didn't sink it yet that's why he's quite unsure if it's the right to do. I agree with your advice to OP by just selling the half and diversify it evenly and the rest just save up or open up a business that you can use for fronting so others won't question your money.
Anyway, OP you have a impressive portfolio and you're lucky that you bought yoyr coins before it boom and these coins are doing good lately.