Old phone transfer stuck on "transfer complete" screen

I just transferred my old phone to my new phone using the quick start transfer. it took me almost 6 hours to complete. After it is complete, I can already use my new phone and all the apps are downloading. But on my old phone, it's still stuck on the "Transfer Complete" screen. I saw on the internet that there is supposed to be a Continue button, but it doesn't appear on my phone. I cannot do anything to my old phone. What should I do with this?