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I think these answers are going to suffer a lot from survivorship bias.

I abandoned my blog. I recommend people make Github open source contributions instead.

Blogging can be a contribution. So many projects lack tutorials or intros that could be served in the blogosphere.

I have a technical blog where I post detailed instructions for anything I had to figure out on my own due to lack of helpful documentation.

Every few months someone will leave a comment saying thank you - and I love that I was able to help someone avoid the hassle that I went through!