Sell in order to buy more when the price dips again.
Correction, never fucking sell unless you need the fucking money. I've never sold since I've been been accumulating bitcoin in 2012. I'll never buy a fucking altcoin ever. I count my blessings I never sold, bitcoin has only appreciated.
When bitcoin doubles or even triples in value after the halving, I'll buy this forum off theymos.
I like using price fluctuations to try to increase my trading bitcoin stash (which is small, but still fun to play with). But you're welcome to do as you see fit.
You'll never accurately predict where the price is going. Keep trying and keep getting cucked, though.
If you were smart like me you'd remove that stupid picture under your name, that stupid "world class retard" under your name and realize the smartest thing to do is fucking hold your coins and never sell.
Actually, when trading bitcoin, there are trading strategies in which a person does not need to attempt to predict short term prices. Of course, it is good to have an overall long-term vision regarding whether the price is ultimately going up or down.
In that regard, if you presume that 1) the prices are going down, then you trade up and down while slowly shedding bitcoins
if you presume 2) prices to be going up, then you trade up and down while slowly accumulating more coins.
I have made quite a few posts on this topic, with the second presumption, and I have described quite specifically how this accumulation can be done, while engaging in little to no ability to predict short term price directions... except continuing to presume that in the long term BTC prices are going up.