But I don't think it's a good idea to focus too relentlessly on the same topic. You can run out of good stuff apart from anything else. And it can make your stream look uniform. If you only ever share content about blogging and traffic generation for example, well, that can get a little boring.
And you do want your personality to come through, remember. It is social media, after all. You want people to get to know you as a person a bit, and consequently warm to you.
That's why there's much to be said for including other kinds of content from time to time -- ideally with wide appeal. It's not unlike the 80:20 rule which advises that one fifth of what you share be promotional, and the rest be entertaining, useful or informative.
So, of that non-promotional content, most of it should be niche-specific, of course. But more general stuff adds variety. Wisdom quotes from famous writers and thinkers go really well, for example. No one can deny the insights of great minds, which is why people enjoy them so much. You'll see these all through social media.
Then there are those inspirational quotes that keep you motivated and looking on the bright side. Some influencers on Facebook who use these a lot are Kim Garst, Edmund Lee and Adrienne Smith. It's quite remarkable how much of this kind of content they share. And they wouldn't do it unless it worked!
This kind of stuff goes very well with visual depictions, too. Uplifting quotes combined with appealing images of eagles soaring, flowers in bloom and the like give people a small but undeniable lift. So they get shared a lot.
Of course this approach isn't for everyone. If it's not your thing, then you shouldn't do it. Still, there's much to be learned from this tactic. It's definitely worth pondering what kind of content that you enjoy has wide appeal and can also be expressed visually. It might take a while to work out what that is. But when you do you'll be onto something very useful.