In trading cryptocurrency, you have to make your own mistakes, gather your own experience and profit and ultimately device your own unique method of trading . There is nothing you want to learn that is not available, just keep an open mind.
I usually take out most of my cash and put it on my bank account so I am not someone who should be giving advice about bitcoin or anything remotely similar however I usually keep some of my coins intact and not withdraw that and I can talk about that.
First of all I usually keep certain amount in my portfolio every month, this means I cashed out during 20k levels and profited a lot while I cashed out at when it was 900 dollars as well which means I lost a lot too, however I also kept some at 900 which means I profited while I kept some at 20k which means I lost some. If you constantly invest, you will be profiting on the long term, do not go all in at once, think of it as installments.