Cancel enough times and the invites stop. That’s not cruelty, it’s math.

Invitations are a form of effort, and people stop spending effort where it has repeatedly gone nowhere. Nobody decides to exclude you. They just reach a point where including you has felt like a wasted message too often, and the thought stops occurring to them. Each cancellation is forgivable, and the pattern does the work.

If you have been cancelling, go first on the next one and actually turn up, even briefly. Say no at the invitation stage rather than yes followed by a message an hour before, since the late drop is the expensive part. When you want back in, propose something specific.