I just checked your blog and I’m seeing posts going back to 2018. Does that seem right?
When Micro.blog publishes a new post to your blog, it first tries to update recent posts so that it’s as fast as possible to get the posts into the feed and home page, and then it updates older posts. Usually this isn’t noticeable but it sounds like it might’ve gotten stuck in an inconsistent state, then resolved itself.
I just checked and all the posts are back indeed! It must have been something like you described in then.
I was looking at the numbers from the Stats plug-in, and the graph showed only 100-something posts from the last year alone, so was a bit shocked at first, but ‘giving it a bit more time’ is actually a very human and micro.bloggy strategy in these kind of situations