it depends on how actively you want to manage and the timeframe
If you intend to hold for 5-10yrs or more, forget about managing. As more funds become available buy the dips.
On very LT, when corpus is 2X-3X you book then re-deploy are waiting for correction.
A slightly passive way is to use covered calls.
Actively, you need to read mkt well for this and buy puts.
super active, dump portf / stocks and re-enter lower.
hyper active, short the holdings intraday on down day.
superman, i'm yet to figure it out myself.