Why are you blogging? If it's because you want to write, then go ahead and write.
After all, one way to improve is to practice. If you don't write, you don't get practice.
If you want to write, but not produce crap on the internet, then delete (or not post) your final product.
Think about your audience. Is is really "other people"? That's a broad topic. Perhaps you can narrow it down. What about writing for yourself, of a year ago? What about writing for a co-worker, or friend, or family member?
Things don't need to be "impressive" to be useful. Even a note to yourself for the future might be useful. You could make it sort of daily diary of something neat you did or learned.
If it doesn't make you happy, then stop.
Another way to help people by writing is to be on chat channels or mailing lists where people ask questions about topics you know.
