Personally, I find American candy way too sweet. As in one full-sized bar of any chocolate candy is disgustingly sweet, and makes me feel unwell if I get anywhere close to finishing a bar
I am American btw, and I grew up eating this stuff for a few weeks after Halloween, but then my tastebuds developed and my answer to that question is to “just eat a couple of pieces a day”
If you want an actual answer, I’d consider trying to remove willpower from the equation and donate or throw away a majority of the candy you have. If you still want to keep candy, then putting it in inconvenient places might make it easier to eat less. Think like keeping it on the opposite side of your residence where you would usually lounge/mindlessly snack and only eating it in a designated area.
You can also try to buy one of those kSafes to prevent yourself from eating it all too. The idea isn’t to depend on your current willpower to decide for you, but rather the rational thought of your past self to allot yourself a certain amount.
It’s like a cheat day, if you designate a day where you can pig out, it’s easier to maintain a well-balanced diet outside of the chest day