For investors: do you add more funds to a strategy during a drawdown, thinking it's "on sale," or do you wait for it to recover?

[not_spiderman]

Been watching my portfolio take hits lately and wondering what others do here.

When your strategy is down 15-20%, do you double down because the entry looks cheaper? Or just sit tight until things turn around?

Seems like there’s arguments for both approaches but curious what actually works in practice.