People will be selling for tax purposes. There will be crash to $7,000 until end of the year. Minimum will be at Dec 20. For 2020, lets be optimistic, halving and such will shoot up bitcoin somewhere to $30,000 and then we have new runaway bull run to somewhere $50K-$100K. I would consider selling some somewhere around $30,000 if that happens in the next 2 years. However, never sell all your bitcoin, because you never know when the true moon will be happening.

I have only $1,500 invested in bitcoin and I bought at $2,800. so i'm not gonna be rich with bitcoin anyway. Even if it goes to $100,000 I will get like $60,000. so I think the big question next year will be about holding or immediate profit. If the bitcoin goes to $28,000 do I sell it for roughly $15,000 profit or do I hold, knowing that the price always goes down at some point. people who bought at $3,000 then sold at $19,000, and then bought again are the boss in my opinion.