Multiclass possibly

Hi im in a campaign right now and we are all level 15 and im a nature cleric but i think I want to multiclass. I've never done it before and wanted some insight. I've been debating on what class id multi into and im wondering on rogue or wizard/sorcerer as my only bad state is charisma (i have a 19 in strength due to an item, a 19 in intelligence due to another item and an 18 in wisdom, then a 14 in dex) but I know level 16 for clerics let's you increase a state so I've been debating on even multiclassing