Scaling out of positions in $DAX futures – how do you manage the mental game?

Hey everyone, been lurking for a while, first post here. I'm finding my footing trading $DAX futures, mostly intraday. One thing I'm consistently struggling with is the psychological aspect of scaling out of winning positions. I've read all the theory about taking partial profits at key resistance levels, letting a runner ride, etc., and I get it intellectually. But in practice, when I see a decent profit on the table, say +50 ticks, I almost always feel compelled to take the whole thing, often just before it makes another significant move. Or conversely, I take a tiny piece off, and then watch the rest of the position come all the way back, feeling like an idiot for not taking more. It's like I'm fighting an internal battle between 'secure the profit' and 'let it run'.

I'm trying to journal it more meticulously, noting exactly why I closed or scaled, but the emotional pull is strong. For those of you consistently profitable in futures, how did you conquer this specific hurdle? Is it purely a matter of discipline over time, or are there specific mental frameworks or routines you use to manage that impulse to fully exit too early, or to not take enough off?