We must measure from our needs first, we cannot immediately conclude that we want to sell or buy, obviously now we already know that the price is already high and what we will do with this high price, because there can be two alternatives, namely the price will go down in the future or keep going up.
If indeed we have other urgent needs, there is nothing wrong with selling some of them in order to cover these needs, but if we have other funds it is better to hold back because many people conclude that there will be an increase from now. if you have more funds it is okay to add to it, but my advice is better buy for potential altcoins because altcoins are currently on the rise too.
so there are other alternatives you can do from the existing funds.
The other smart choice is to say you have enough and getting out. I personally do not have anywhere NEAR that amount, but if I ever had like a million dollars for example, I would sell that, take the cash, put it in my bank account, and will live with that forever. When you have 1 million dollars and put it in a bank, they will give you a bit of interest rate as well, and if I spend about 750 bucks per month, for 50 years, that is still half a million bitcoin (not even that, 450k), so if I spend 1500 dollars (which I don't) for 50 years, that is still 900k.
Believe me that is waaaaay more than enough for me, I am not going to spend 1500 dollars a month, 750 is around enough, sometimes not enough because of unexpected things, sometimes barely enough, but that is on average what I spend monthly, if I have enough money to spend 1500 dollars per month for 50 years, that is enough to retire. So if you want to fully get out, and just retire and have fun for the rest of your life, that would be a smart decision too.