The market has much fewer opportunities for certainty than you think. As a retail investor, you can't find them by looking at fundamentals or K technical analysis. Only a few, such as the black and white equation, are truly certain by using tools to build advantages. Or some arbitrage opportunities.
Don't mistakenly think that your prediction of the market is certain. If you are bullish, you go long, and if you are bearish, you go short. Think about the strategy, at least consider the most basic acceptable loss, stop profit, position size, and use spot or contract or option or loan tools.
As Livermore said: "The first step is to estimate the future market and potential of a certain stock; the second step is to determine at what price to enter the market. At other times, you should stay out of it and let the market gradually develop trends."