The last few Minecraft updates have increased the maximum resource pack size to a staggering 250MB. This is plenty for dozens of custom tracks to be included without the need for laggy and desynchronizing note block tracks. Additionally, the slider for music volume could apply to the ingame music for Wynncraft. Of course, the main drawback is that it only works on 1.18 clients, but Wynncraft has to update eventually, and I suspect they'll choose to sooner rather than later. This feature could be an excellent selling point to the players.