Congrats on the following! It sounds like you’re in a great spot to grow your personal brand.
I’ve seen a lot of TikTokers grow their YouTube channel by doing story times or ending their TikToks with ‘more on my YT channel’.
Ultimately, it depends on your content and the type of stuff you post, but I’d recommend hone in on why these people are following you, and what do they want to see? How does this translate onto the other channels, and how can you successfully cater your content to be better suited for those channels?
Think about that last part; if someone loves your videos on TikTok, they don’t want to see the same videos on your Instagram. What else can you offer as a segue into these other channels that your followers can’t get from your TikTok?