TikTok will always release more dopamine than doing basically anything else I can do. That doesn't mean I'm uninterested in doing other things, it just means tiktok has succeeded in optimizing content that immediately releases dopamine.
The good thing about my type of ADHD is I get addicted to things and then lose interest in them. TikTok is no longer exciting for me now, now that I am just using it for live DJs and checking out the videos my best friend shares with me and not much else. Got addicted to Reddit and then Twitter for years but now my Twitter addiction has largely been replaced with Manifold Markets. The key is to find balance, or to impose a rule on yourself that you only go to the problematic site a little bit unless you have spare time, or to find something else more exciting.
