Everything wears down over time. Right?

Sure.

So, the next question is, how can we combat that? Here’s a random idea that I’ve done no research on yet..

In order to have a material that lasts, first need the main structure part, then a layer for attracting atoms that are abundant so that only those abundant atoms are lost over time through erosion and normal circumstances, and not the main material or layer that collects the other atoms. Of course this could just be two layers also. Would the special carbon bonds and structures in a diamond be good for everything as the main material without wearing down? Maybe not because some/many structures require some elasticity. So, no man-made material unless it can accurately mimic the reproducing part of life cycle autonomously? That technology could quickly become dangerous also.