Because nobody knows when the market will start to rise. But, as I expected, this time not from Sales just stopped and watched the market and appreciate this time with I family on the grounds that in a few months the market will start to rise. So this time there is no compelling reason to offer. I don't know myself and I can't predict the increase. But if the coin that I hold is valid and worth holding, I better hold it or I have to cut my losses.
I think its better to do both selling and investing because you cannot say when the market would increase or decrease its price. You can also do sell then invest the money again because you might double your profit if you invest in a more better coin.
I agree with you because like you said we dont know if our holdings are good to sell but if you afraid to lose you can do half selling your holding , when buying you always do the method of all traders just buy low sell high to avoid loss. Yes i like that buying better coin is good but know the project and coins first .