You can attempt to access the video by appending the ID to the standard TikTok URL structure: https://tiktok.com Finding Content on TikTok
Explore the Discover section at the bottom of the app to see trending hashtags and sounds that might be related to the video.
Narrow your search by "Watch history" or specific dates if you are looking for a video you previously viewed.
Discover and search - TikTok Support
If a direct link does not work (which may happen if the video is private, deleted, or region-locked), you can use these official TikTok Support tools to find similar or lost content: