Either pick a number for yourself, could be when BTC hits x price or after x years and just stick to it no matter what.
That being said there is also the never sell option, say you have 1 BTC at $1,000,000 by the time it hits that value itll be very easy to use that as collateral for whatever business venture or ventures you may want to dwell into and as long as you are successful you never sell and just hold as part of your portfolio.
Thats at least my thoughts on it, not advice and im pretty new to crypto in the grand scheme.