I wait for the BTC chart to go sideways before I buy right away. It's a bit risky if I enter too early, but I don't understand why I dollar-cost average at the bottom, and now I've made this much from the previous amount of 300 dollars.

Don't be too scared, the game gets harder as time goes on. Whatever happens now will recover faster next year, so don't worry too much, especially for newcomers. For those who have been playing for a long time, I want to ask: which two systems should be prioritized?