As shown by this thread, you get responses...
If you mean the massive, trump, antenatal, wooly hugs, feminist, etc threads, that have a group, even the weight loss ones for that matter, unless you post regularly, you do get forgotten. Or by the very nature of the thread, it has moved on by the time you get back to it.
But it is not a clique, you simply need to post more and become part of the known people on the thread, that is your choice.
You have chosen to name change, fine, 99% of the time I don't recognise usernames, and I am sure many are similar.
In other words, you are coming at this from the wrong angle, post a banal thread, it won't get replies, post an insightful or inflammatory reply/thread and you will ;)