Before doing anything else, I structured my Unity project folders following this guide. This took some time since most my imported assets had lots of subfolders, most of which were unused since I didn't use the assets in my scene.
I also used the same naming convention used by Unity's preview packages itself:
Camel casing.
Starting with capital letters.
Textures include _Normal or _Albedo or _Smoothness etc.
File ends with _Mat or _Prf etc.
I stayed consistent with the way Unity names some variables in the inspector, like smoothness (instead of roughness).