"But all of these things [reasons why people don't care about your blog] are not a problem, because you shouldn’t care even a little bit about what other think."

I mean... Maybe you should care sometimes? Maybe it is good to try and not repeat others and try to express original and useful thoughts?

I have written some stuff in the past that was purely for me, but have also written explainers and other stuff that was actually meant to be of benefit to people who found or read it* (even if very few people did read it). This all-or-nothing stance is kind of silly. The title is also rather misleading, but I guess that's good for upvotes...

* I won't link to it as I don't mean for this to be a plug, but just as an example - I wrote "Things Everyone Should Know About Depression", because I found most articles of that sort lacking. And I put in a lot of work into making that a good post because I did care about its impact on potential readers, and I do think it probably helped some people.

Not everything has to be just written with only yourself in mind, even if fundamentally the reason to write should be that you want to write moreso than for the potential of getting lots of readers.