Social media like tiktok definitely has benefits, but based on my research, the harms considerably outweigh the benefits. You can start limiting its negativity by putting a time limit such as 15 minutes and making an oath with Allah that you will only look for beneficial content. Don’t allow yourself to be go from one clip to another aimlessly. So put an alarm and do your best to stick to the time limit.
If you find yourself unable to do that, I’d recommend deleting your account. I know it’s a big step to take, but it would be in your interest to do that.