Zac: For me, focus is the killer of existing start ups. If you drill and you hit oil, keep drilling. Do not dismantle the rig. It's all about this a, d d, a d h d that we all have,. Zac: You figure out something you're great at, you figure out something the world needs, and you just do more of it. He says he did more investments in the last year than i did in my first six years of investing.