As a warning: every time I’ve pushed hard, then had to rein it in and do less, I’ve gotten fired.
There’s nothing you can do that makes you irreplaceable, even if you’re the only one in the world that can do it.
It’s fine if you want to stay in your happy place as the only one that can do X and then keep selling them on the value you provide and how you’re doing big things. But, nothing lasts.
Don’t burn out, but sitting on your ass is a bad strategy.