Selling is depending on your limitation you need to set a limit to avoid unnecessary loss, sometimes crypto is very hard to understand i experience so many situation like continuous dropping of price after we buy and rising of price after we sell so many regrets and so many wrong decision it is normal for we don't know when the price rise or when it fall the important thing is that we have limit on when we sell our holdings it is better to earn small amount than nothing.
There will be times when you need to cut loss. Setting a limit will help you cut those losses before you entirely wipe out your balance based on the market's move.
And knowing when to sell your bitcoin, you've got to plan it out. As we approach to another month and we're already half of February, there could be a lot of changes in the pricing. You don't sell when you're at a total loss but that's okay when you manage to cut loss when you're unsure to avoid further losses.