Yes, reposts on tiktok can help make your content more visible, but not in the direct way many people think, unlike other platforms, a repost on tiktok isn't like a retweet that gives the original video a viral boost, what it does is simpler, it puts that video in your followers' feeds, even if they don't follow the original creator. It's like a personal recommendation from you.
The real value of a repost lies in the context and curation, if you repost a video and also add a comment like check out this tip that saved me, that comment becomes associated with the repost and gives the original content a second life, especially if you have a community that trusts your judgment, the algorithm interprets this as you actively participating and sharing value, not just passively watching.
The trick to getting the most out of reposts is not to use them indiscriminately, many people repost ten videos an hour, and that doesn't add anything, the key is to choose content that truly contributes to your niche and that interests your audience, if you repost something related to your topic, your profile becomes more interesting and people have more reasons to follow you, reposting doesn't magically double your views, but when used effectively, it's another tool for building community.