$100k may not have the same value as it had 20 or 30 years ago, but it is still a lot of money today
BTC's value and that of fiat is different, BTC has a limited supply and with a high demand it gets a higher value, all of which happens in a decentralized way. Fiat currencies get their value from their government policies, economics, etc, all being centralized. Though BTC is not yet a legal tender anywhere other than El Salvador and even though you can spend it in almost everywhere in the world, it is still in very small numbers, and you have to convert it to fiat most times. So BTC's value still has to be measured in fiat currencies to understand its purchasing strength.
When you sell would not change the value of the fiat currency you are converting to or how much inflation is affecting it, even if you hypotetically sell when 1BTC is $300k or more, if the fiat money is worthless then, once you convert it to fiat it no longer worths anything too. What i believe is there is no need to sell off BTC's completely and move back into a censorship currency, it is better to hold a censorship resistant currency and convert to fiat when you need to.