I'm not trying to pick on you, Rote90, this is just a perfect illustration of something I've seen here and elsewhere : Realizing you're repeating yourself is a good first step, the second step would be not doing so. My advice is this. If you really can't drop a topic (I'm saying this as someone who has some difficulty doing so) you should strive to come up with new arguments every time you post.
To play this game all you need to do is make a habit of skimming through your own posts to remind yourself of which arguments you've used, which videos you've linked etc... Then, if you catch yourself saying something like that quote, change your point or delete that section. (If you want to play on hard mode, read the entire thread and repeat no one else's arguments either - but quoting to say you agree is fine according to these rules I'm making up.)
The beauty of this game is it will help you find your best arguments. If you're actually willing to never repeat yourself, you'll hit a block at some point, keep thinking about the topic, and find a brilliant idea under the shower three days later. The forum will still be here, ready to debate your fresh take with renewed passion.
Finally, when you've dug deep and said everything meaningful you felt needed saying, it's a lot easier to let a topic go. The Red Queen is right to say there's no obligation of consensus on the forum. Which means someone at some point is going to have to let something go. I don't feel repetition is a step in that direction.
