To see your posts click on the three lines (burger) next to your profile pic.
I know what you mean about finding threads. I think it’s because the home page doesn’t look like it used to and the various forums don’t seem as distinct as they were so it looks like just a mass of disorganised posts. I’ve been navigating by going to my posts, and looking at the activity around my posts plus looking at new and recent posts rather than navigating from the home page as I’m not sure which one that is!