Now bitcoin is growing very fast and it must end sometime. Most likely something like 2017 will happen. Therefore, if I were you, I would not sell all bitcoin, but part of it needs to be sold while its prices are so high.
I happen to sell some in between due to personal requirement of money during lockdown days. Had no choice so no regret that sold for cheap as after that bitcoin price has risen. But continue holding the rest and will do so because it seems that we might see crossing 20k soon. As well looking to buy during the dips as a short term investment.