Of course, it is ok to sell buy or do whatever you want. This is your money. Nobody said you shouldn't sell or buy.
Yet, you make a sell claim at a price that appears to be the bottom. Sure it can go down a lot more, but the odds suggest your advice to sell right now is terrible.
What is the reason for writing this? You had these thoughts in you for quite a while and thought of spitting them out AFTER Bitcoin dropped by 75%?