This plugin was just re-written and will contain bugs. I will fix them if you report them to me.
Advanced Drop manager lets you change all drops on your server. You can change the drops of mobs, blocks, fishing, leaf decay and piglin bartering. Feel free to suggest more.
It uses a poweful condition system that lets you precisely decide how and when to drop items. You can give premium players extra drops when they have a condition or make gold ore drop extra nuggets when its mined below a certain hight. You can hook into any plugin that provides placeholder for PlaceholderAPI.