What is the small correction that changed things for you? The less obvious the better.
Hip movement and feints changed my game to get better in generating power
For me it was actually relaxing more. The famous Michael J White teachings of not telegraphing strikes was a personal game changer for me to drive this (though I remain trash at striking).
I used to tense up (subconsciously) because I was trying to punch hard, which just made everything slower and more arm-dominant. Once I started staying loose through the movement and only really bracing at the point of impact, the shots felt noticeably heavier.
Sounds backwards, but trying less hard to hit hard probably made the biggest difference.
I believe you actually hit harder when you’re not forcing it and trying to hit harder. Counterintuitive I know… but so is the case with a lot of beneficial fighting techniques.