Personally, I like Risto's (user name rpietila) thread in regards to thinking about bitcoin selling (
Sane and simple savings thread ), even though the thread was started more than 9 years ago, Risto turned out to be a bit of a scammer and a Monero pumper and also Risto is no longer with us (RIP).. but still in that thread (including the OP) there are some good framework ideas in regards to some ways to think about how to consider selling BTC.
About that thread, yes it's quite old and even I just found out about it. I wasn't even born then LOL.
I try to have a framework that I agree on sales, maybe something like 10%-20% on every goal that is hit. But of course, I wouldn't do it for under $70K. It will be interesting to wait for the next proof of ATH, I guess it will only be in a few years. But the idea remains the same, that's been said.