I really can't hold onto spot positions; as soon as it rises a little, I want to "take profits first," but then I look back and chase the high; futures are even more ridiculous, opening positions like ordering takeout, a slight shake of the hand and leverage is applied, in the end either holding until it blows up or being slowly worn down by funding rates.

Later, I set a simple rule for myself: don't think about making all the money in one shot, first consider "what's the worst I could lose on this trade, and can I still sleep?"
If I can sleep, I go ahead; if I can't, I shrink back.

Recently, everyone is arguing about rate cut expectations, the US dollar index, and risk assets rising and falling together... Honestly, I can't figure out macro stuff either, so I won't use it as an excuse to add to my positions.
Keep your position smaller, place stop-losses at levels where I can admit I was wrong, otherwise it's just emotional trading.
Anyway, what I've learned isn't skills, but that: I simply can't endure that much.