Which things to persist on and which to quit

Running a business is an endless barrage of problems, fires, and obstacles that require you to provide an answer. Do you persist, or do you quit? Sometimes the answer is quit: you stop doing something. Most of the time, the answer is persist. Collect more data. Stick it out longer. See where things go, and double down. The hardest part of building a company and running it as you scale is deciding which things to persist on and which to quit.