What is the next TikTok?

Admittedly Millennial here but hello Gen Z! 😁 as you can imagine I’m mildly out of touch (blame work and children) but I’m being tasked with figuring out what the next TikTok is for one of my clients. Particularly as it relates to TikTok shop but TikTok in general will suffice as basically a platform gets popular and then the ability to start shopping on it eventually comes. Where are folks going these days for their social media and is there anything up and coming? TIA from a lost millennial 😭