when I was younger I used to watch and like videos that had kufr things in it.I forgot about them and a couple years later when I learned more about Islam I repented for all my actions.Recently I’ve come across those videos again and unliked them.Would I have to repent again or say my shahada again?

Ustadh AbdulAziz al-Haqqan

No this is waswas that needs to be utterly ignored.