Delegating. Not just coding tasks — everything operational.
I spent way too long thinking "I'll just do this myself, it's faster." Turns out that thinking compounds in the wrong direction. Every hour you spend on admin, reporting, or coordination is an hour not spent on the actual product.
The moment I started treating my own time like a scarce engineering resource and offloading the repetitive ops work, my output changed completely. Wish I'd treated delegation as a skill to build from day one, not something you graduate into when you're "big enough."