Having a strategy IMO, can be effective in sports betting and skill games. Even if it's "poor". But for games like slots or lottery, which are based on luck, I don't believe that strategy matters. Besides having control over your bankroll and emotions, I can't think of anything else that you can call a strategy and affect your winnings. I don't know if someone uses a strategy for such games, but for me, never change anything, no matter what I try. And things like playing in a tournament for bigger chances or specific days of the week/ month/ year, I can't consider them as a real strategy. Luck matters the most, and it can hit you at any time or never.