If you get into sprint mentality you will burn out. The market is ever changing. Right now it's in a huge state of flux and fast movers will get burnt because they will optimize for something that will no longer exist by the time they finish optimizing
Focus instead on the slow path - a marathon of improving your writing relentlessly, improving and polishing your books constantly, and reaching more and more readers and building more and more relationships tirelessly
Focus on building your own direct channels to customers, which you own and control 100%. Do not build everything around existing marketing channels as most existing marketing channels will be gone/destroyed in 3 to 4 years