If you sell now you will be regretting when bitcoin get to $50,000 or $200,000 in some years to come as it has happened before and most times we regret selling too early.
Not everyone is selling; most of bitcoiners are simply following how Mr.Satoshi is doing like myself! 
. When you do believe into the future of bitcoins then you will never look for cashing out it too early but you will wait for decades to get all the fruits of your patience. Halving is a scheduled trigger and it definitely bring lots of magic in upcoming months but people who rush and treat bitcoins just another investment opportunity may regret for their action of net being patience enough.factors such as the halving that would happen in the later months that could be the catalyst for the price development of Bitcoin and an increase in number of players and supporters of the currency: investors and traders of Bitcoin
Those catalysts are interlinked or cyclic-dependent. It means halving will trigger new ATH and new prices will attract new adopters and these new bitcoiners will take bitcoins into new ATH and in-between another halving will occur. This is the reason one bullion dollars level too possible for bitcoins by end of this decade.