Be very careful when messing with your System 1. It's not designed to be reversible. Unlearning is at least 10x harder than learning.
Can you provide evidence for this? It hasn't been my experience. For example, my understanding is that fears exist in System 1, and I've had experiences where I accidentally gave myself fears of things and then subsequently deliberately got over them through exposure therapy etc.
Well, I tried looking it up, but can't find much in a pinch, but here is one reference: http://learnmem.cshlp.org/content/11/5/566.short
If you believe it, unlearning (extinction) does not remove the old learning, it covers it up with an extra layer of compensatory learning, while the original habits still lurk underneath. Which matches my experience tutoring students who learned a bad technique, or observing people (including myself) who learned a bad habit: even after a lot of effort it is really easy to slip up into them.
Sometimes our minds suddenly "click" and we see a topic in a new light. Or sometimes we think we understand an idea, think it's stupid and ignore attempts to explain it ("yeah, I already know that"), until we suddenly realize that our understanding was wrong.
This kind of insight is supposedly hard to transmit, but it might be worth a try!
So, what kind of important and valuable insights do you wish you had earlier? Could you try to explain briefly what led to the insight, in a way that might help others get it?