Lets take the following example. You buy BTC at 6k and it goes up to 8K. Do you sell 100% of it or do you sell 75% and keep 25% in BTC.
What are your opinions / tactics?
God! No way man. You cannot sell all of it. Act wisely. You need to hodl for some of the coins at least. The coins like PRG, ADA and EOS are very good for investments but you must never ever sell these coins all at once.
why not, you can always buy back. not like once you sold off you missed the profit... unless the profit you made is cash out and spend it on other stuff.