I have an idea, maybe for the year aniversary which is in 323 days, you could add a custom helmet or pickaxe proving loyalty, also the early the better for it. and if it was a hat it could be like a new years hat thats like 6M! or 1Y! it would be cool, just a cosmetic.
Since Serenitrove is client-sided, there's unfortunately no way for the game to know when someone started playing, so "loyalty" rewards are not possible.
That said, seasonal or event-based hats, like something for Halloween, Thanksgiving, or even a 1-year anniversary could be fun. I'll keep that in mind as we get closer to the big day.