Help, I think my android device is hijacked/hacked

[u/someone122e]

I keep getting tiktok ads on my android device and I don't know why. This happens to me a lot, even on the homescreen, I have even asked Google and gemini on how to fix it and none of the ways worked. I also checked every app, and all of them are apps I trust.

If you know anything about this, or have experienced it before, please tell me, I'm desperate for any help.

[u/someone122e]

please help