I understand what you are asking, clearly every investment decision will definitely involve risk, for Bitcoin prices can go up or down dramatically. However, it can all be anticipated with some other people's experiences that we can follow or roughly speaking (cheating).
Usually a major correction will occur after reaching the ATH, but Bitcoin and crypto markets are also known for their high volatility. Especially for those who FOMO is very stupid because they don't understand the habitability of a market and get stuck in a situation where they can't afford to sell it back because the price is plunging down and it takes a long time to wait for it to stabilize again.