YouTube reused content

I think you should look for a different development path, because copyright regulations will become increasingly difficult later on.

Translating and re-uploading foreign clips will eventually trigger a reused policy warning during channel re-evaluations. Youtube requires significant transformative value like your own voiceover commentary, high effort editing, or adding a original narrative context if you want to keep the channel monetized long term.

Loribil said:

So, I have to delete the old videos and refresh all the other content.

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If your old videos are less in quantity and you already started new videos with some detailing so there is no need to delete old ones.