Buying a coin that just created an ATH is highly risky especially while going with leverage.
in the case of bitcoin i would say FUD is worse. Speaking from experience sold my btc in loss around dec 2022 during the FTX bankruptcy but bitcoin bounced back in 2023 and exceeded its 2022 all time high and its still rising.FOMO is not really something i would associate with bitcoin now since this isn't anywhere close to its peak not to mention its volatility isn't the highest.
Greed and fear are the two emotions that kills in trading or make you richer. Just try to strike a balance.
In the case of HODL, there's no specific time period is based on the owner and their wants. Some hold with respect to time, Price or even profit. Your Hodling shouldn't be copied from another. You know your target, what you aiming for but as many would advice even if you are selling.
Do not be a Nocoiner