I’m sure others have expressed the same idea on various platforms, but I made a proposal in relation to this (granting account anniversary rewards every year) in August 2019. Despite gaining a reasonable amount of support (in comparison to the amount of traffic this part of the forum receives), including the backing of at least one moderator, it seemingly never went anywhere, unfortunately.
I still hope that this sort of idea could be implemented, but I wouldn’t advise holding your breath.