Aren't all personal blogs shallow and self-obsessive? (Maybe I'm being too cynical.)
I have similar difficulties with my own, which is why it gets updated so rarely. Some (too many I think) spend a lot of time writing stuff that is mainly of interest to other writers. To my mind an author's blog should about your own work and whatever personal stuff you have a mind to share (for me that's not much). The problem with that is that writing is such a slow business that there doesn't seem a lot to say unless you have a big fan base writing in asking questions and comments. Until that happens ... what do you do? I suppose that's why so many branch out, and where can they branch except to what interests them: writing. I just don't see that as a very fruitful way of encouraging reader participation.
All of which is of very little help to you, I know. But at least you know you're not alone.
If you have an interest outside your writing that could add another spark then you could try that. I was hoping the photos I added to my articles might help (that being another hobby of mine), but maybe I need to have more to say about the photos themselves. My other main interest is software development and computer security, I've lots to say on those topics, but it doesn't seem appropriate for an author's website
.