I've encountered that, too. It sucks, and evidently "infinite" scrolling really isn't infinite.
The only workaround I've found is one a few here have suggested, but it's laborious as hell, which is to systematically use steemd to access each post from the start forward and store the titles and URLs in a bookmarks folder in your browser. I've set mine up for year by year to keep it manageable, size-wise... you have about as many top-level posts as I do, so I'd recommend that.
The whole process also made me really annoyed (once again!) that Steemit doesn't time stamp posts. I've chosen to add my own at the bottom of posts, for about a year...
Try https://eonwarped.github.io/steem/allposts.html?account=denmarkguy . Hosted on my github pages site. Can filter by tag as well.
(Apologies if this is starting to look like I am spamming, but I really think people can make use of this tool)