So get a blog that complies with ActivityPub or host a Pleroma instance with an account that mirrors your blogposts / posts them on the fediverse. Shouldn't be hard.
Don't use the old ownCloud mess, use the new one. I'm currently running ownCloud 10 and it works great. The stability and architecture of the project have really improved in the last years.
It seems to be scalable too, when you look at the big organizations running ownCloud. All the know-how and feedback of the big instances is flowing into ownCloud, not nextcloud. Speaks for alpha-quality.
I have not tried the migration from nextcloud to ownCloud yet, but it should not be too hard.
ownCloud seems to be going for hosting small and medium sized businesses, I'm not sure what that means for big organizations in the future.
Our customers tend to be bigger, actually. Like the German federal government with 300K users, companies like Siemens, german Radio & TV stations (transferring over 1TB/day!). Our biggest deployment (in a single instance) is over 20 million users - see nextcloud.com/globalscale for how we pull that off. ownCloud has no equivalent solution for such installations and breaks down at about 50K users.
For home users or very small businesses, the difference might not be that big but the migrations we do for customers show time and again that there is a big improvement in performance and reliability, especially on large installations.
