How to know it’s time to delete that TikTok post?

I’ve been trying to grow on TikTok, and I know people say don’t delete a TikTok post ever (or Only You to see thing) because there’s a chance that it go viral one day but i think when you to viral and people check your profile, there’s a high chance they’d follow you it your content were doing good. However I have some posts that didn’t do well but it’s still good for brands to see my niche (usually stoppable content), so it’s like sacrificing for either followers or a chance for brands to see it. So, what are the signs that it’s to let go this post, especially that for me when a post didn’t do well from the start it never do in any near future 😆