If your username is the same on all of your social media platforms, this is great. If not, they should not be all that different (for example, you are "investingbob" on TikTok and "investingwithbob" on Instagram).
TikTok allows you to connect your IG or YT profile, but after doing so, many people claim that their numbers plummeted. This should not happen, but you know, TikTok occasionally does things to keep them at the top spot. I'd recommend adding your LinkedTree or other link-in-bio tools of choice; TikTok doesn't appear to target it presently.