Building a personal brand without taking time away from other things is not very realistic in my experience. I’ve recently made the same realization that I should work on a personal brand so I agree with your premise, but it’s definitely required time and effort just to get a few more followers.
Twitter accounts with 3 followers and blogs with 2 articles and 12 views don’t usually show up on the first page of search results. Not only that but if they do show up, it’s probably not the best first impression.
I’m curious how you reconcile posting things of value regularly and not taking any time away from other activities.