That's basically why I don't have a blog. I know I would end up with a few posts and then a multi-year gap in it.
But I like discussions on HN. There is just enough variety and interesting mix of topics. Also the style is more conversational, while a blog is more narrative (fire-side chat vs a presentation in front of an audience).
There should be an "HN-post-history-to-blog-format" library or service. Maybe something that picks the most interesting discussions in last X years.
[0] https://github.com/HackerNews/API
Also, there's nothing really wrong with having a blog with no recent updates. I know there's this idea that a blog needs to be regularly updated. But a blog with just 2 valuable posts made 2 years ago, is a valuable thing!
If you just want to write some stuff and put it online, without the feeling of some ongoing obligation -- here are a few options:
https://medium.com/@jason.sackey/apps-for-super-fast-web-pub...
I hope you will be encouraged to post some stuff.