Simple yet hard push your self until you can't throw one more punch or can't throw another kick then go another round

It comes with age and maturity

perfect your kata.

No explanation needed. If you don't know what I mean by growing mentally tougher and more disciplined, you probably don't train that hard. I'm asking because I'm just looking for better ways to for example:

not give up until I go to the hospital or die fighting

just being tougher mentally. I heard Jon Jones talk about this.