Some people keep a rainy day fund, myself I keep a REKT FUND!
Every paycheck I load more money into an account than what I convert into Bitcoin. Over time that account builds an excessive amount of fiat because more is coming in than going out.
If I get the shocked feeling that Bitcoin is getting REKT, I then take the residual account funds and smash the BUY button.
Think of it like saving up for a Black Friday sale. Fun part is I never know how much is in the account each time.