The antidote I’ve found for this is to write for only two people. First, write for yourself, both your present self whose thinking will be clarified by distilling an idea through writing and editing, and your future self who will be able to look back on these words and be reminded of the context in which they were written.
Second, write for a single person who you have in mind as the perfect person to read what you write, almost like a letter, even if they never will, or a person who you’re sure will read it because of a connection you have to them (hi Mom!). Even on my moblog I have a frequent commenter who I’ll often keep in mind when posting a photo, curious to see her reaction.
Write for yourself and an audience of 1. The reality is there’s probably multiples of that 1 person. But who’s counting anyway?