ATH is one of the best time to end the trade, then you can buy again when the price falls at your own convenience so you can start afresh in as much as you've already made profit once too even when that wasn't your target, but that doesn't mean when you see little profits you should always take them and and always reinvest. Just like you've said that you've made up your mind to hold the token for many years then it'll be preferable you stick to your plans because this crypto can be tricky sometimes and if you're afraid of losing you'll end up closing your trade at a price you didn't plan. As a newbie, one of the best quality you can acquire is to have the courage to HODL no matter the current Market condition, if you can achieve this, then you can archive success in this crypto space. Tokens might be funny sometimes but I assure you if you're patient enough for it to hit your take profit then you'll know the benefits of holding despite the current market challenge, instead of selling at loss because the token hits a new ATH you never planned, wait patiently, this is crypto, even if it's not now, someday it'll sure hit your target