super new to snapchat ads, why is my campaign optimization always failing to deliver results?

just launched my first few snapchat ad campaigns and it's been a real struggle. i'm trying to figure out campaign optimization but my ads just aren't perfoming well, like, at all, and i'm not sure if my overall snapchat advertising strategy is even set up right. what are the absolute first things a total beginner should check when their snapchat ads aren't getting any traction or conversions? thanks in advance!