I tried blogging once. Also didn't have enough ideas for content and no compelling theme, to boot. Used to have imposter syndrome bad, but at some point I just stopped caring about it.
What I DID do was to write things down. Any time I discovered a new thing (risk managment, recovery-oriented computing, various consulting tips/tricks/and so on) I wrote down what I wanted to remember. But I wrote that down on my web site, in HTML. Sometimes when I procrastinate I look to improve the layout, language or content.
There's not a huge amount of content there (maybe 20 posts?), but it seems to interest others so that's ok I guess. I'm happy with my blogging-but-not-blogging thing. It scratches the itch without consuming me, my time, and I don't need an editor.
That said there's a lot of other stuff on there that floats my boat, so there's that work/play variety which floats my boat.