You can overshoot or undershoot. You can do too much and you can do too little. Most of the time, you’re doing great either way!
We’ve all cooked too much food at some point. It’s not a waste; a little Tupperware and suddenly “mistakenly making too much food” turns into “intelligently preparing meals for the next few days.” Most effort rolls over. Wrote too many words? Put half of them into a new project.
Or maybe you undershot a little. You meant to build a bridge, but you built half a bridge. Half a bridge, by itself, isn’t much more useful than no bridge at all – but someone else out there is probably in possession of half a bridge, too. In fact, I guarantee it. Not only can you combine efforts, but the very act of doing so builds something even more valuable than the bridge itself – it builds somewhere for it to go. Now you have a new friend!
The point is, don’t get too hung up on “the right amount” of a good thing. Your life isn’t really discrete like that. You’ll be cooking and writing and building your whole life, a continual stream of pasta and pages and bridges. You can always chop it all up into the correct portions later. For now, just do the things you love and let them flow. They’ll connect when they’re meant to.