If you’re going to have 60 textures, then the only thing to change above would be putting that code in a loop, and maybe storing all the textures in an array. You don’t need 60 variables, just an array.
You might have an easier time using something like Troika-3d-text: library for SDF text rendering. With images you have a tradeoff — large images are slow to upload, small images don’t show crisp text. SDF fonts are crisper and more efficient, especially if the text is dynamic.