I get it. You have a life. You can't sit by the computer all day eating biscuits and hitting "Refresh." (Though, no judgment if you do).
Here's the pro strategy: Set up a price alert. Use Google Flights or Skyscanner. They'll email you when prices drop, even before the official sale announcement.
Or, if you're feeling old-school, sign up for the British Airways newsletter. It's annoying, I know, but it's the fastest way to get the "Sale Starts Now!" ping.
British Airways | Caribtours
And for the love of all things British, clear your browser cookies before searching. Airlines sometimes track your interest and raise prices. Yes, it's a thing. Paranoid? Maybe. Effective? Absolutely.