I’m only 52 so let me try to help you out.
The easiest way to keep track of a thread is to subscribe to it. You will then get a notification (either online / in app or via email if you choose) when there is a new post to it. Threads get buried after not having any posts for a while and new threads push them down the list. If you care to track a thread, subscribing to it also let’s you go to your control panel and click on “list subscriptions” and you will see threads you posted to and / or subscribed to. (Or just “Subscription” in the app.). You can also unsubscribe to threads there as well. Here are links to a couple of the threads you mentioned:
https://f80.bimmerpost.com/forums/sh...572367&page=41
https://f80.bimmerpost.com/forums/sh...1681477&page=4
You can also search for threads.
(I’m a tenderloin guy but nice looking steaks.)