If you want the exact equivalent to a twitter thread, you need to click on your post and reply to the last one in the sequence. This means that if someone shares just htat one, the reader can find the whole thread. And that's a pretty good way to do it, actually. Just try to not exceed 5 posts

THANK YOU! I've been trying to do all my replies off the original post. I'll absolutely try this next. Really appreciate it!