And you don't have to. You shouldn't. Marketing, rather than being a flood of information about you and yours, should be a steady drip, drip, drip, like watering a delicate plant, not hosing down an elephant.
I've spent my adult life working with automation and efficiency using computers so any time there's a task with repeatable steps, I look for a way to make those repeating parts automatic. It allows me to spend my time on the unique bits, the parts I can do better than a computer because they require creativity or special knowledge.
Automating and scheduling your online marketing is smart. Create messages (that's the 'unique to you' bit) and schedule them in a single monthly session. (We use and recommend Hootsuite but there are a number of social media automation tools available.)
You still have to check in daily to interact with the real human beings who touch your social media messages, but you don't have to be online 24/7 to keep your message (remember those 80/20 principles, both of them) in front of potential readers and fans.