I agree with your opinion cause i saw bitcoin up down in 2017 to 18. Now we should sell btc and start real life business. Today bitcoin price is high but this price is not stable for long life. So i tell don't hold today for life time.
what you say is clearly different because the events of 2018 are not the same as this year, where there was no correction at the beginning of this year, instead it continues to increase and even continues to grow making ATH renewable. this indicates that bitcoin has experienced a very good increase.
If you sell it, it is clear that you are at a loss, other than if you get bitcoin since 2018, you can let some of it loose, because you have already received a fairly large value, but it is not advisable to sell everything.
Please remember that the increase in bitcoins will still take a long time and possibly until the end of the year, so you can imagine how much value will happen to bitcoins, and what if you don't have any more bitcoins, because you have sold all.