@OP you don't have to post consecutively with different quotes and replies, if you're going to reply and no one has replied yet you can merge all of your replies in one post.
Why not hold them forever? Too risky? I'm a bit hesitant also, because what if it goes up to a million in 10 years? 
It's not risky to hold them forever or if that's the risk that you're thinking about then don't sell all of your BTCs. Sell only what you are going to need and hold what you want to hold for that long. It says I will be charged almost 30k!! and I bought the bitcoin more than a year ago ....I used the bitcoin tax calculator to get a rough estimate: https://ibb.co/0M9mqRv
That's a lot but knowing that it's one of the permanent things in the world, death and taxes. and I bought the bitcoin more than a year ago ....I used the bitcoin tax calculator to get a rough estimate: https://ibb.co/0M9mqRv