They're going to have a pretty developed and stable picture of you and what you respond to by now, especially of their view of you aligns with high- value placements already.
So they probably don't bother to audition that kind of content for you very often because they already have strategies that milk your attention, engagement, and wallet better.
When you hear other people share their experience as new or different users, keep in mind how customized all these platforms are and how idiosycratically optimized they'll already be for you as a long-time, engaged user.
Most people can't go back in time to get where you are, and don't have any sure (or worthwhile) road to get there.