EXCEL I cannot add any more collected account names to be able to remove duplicates. I currently have 1,004,000 people and that is the maximum number

I send bulk messages on Instagram. I gather a group of people, which I paste in Excel and delete duplicates. I currently have 1,004,000 people and that is the maximum number of rows in Excel.

I cannot add any more collected account names to be able to remove duplicates.

As I paste in the column next to it and want to remove these two, it doesn't show duplicates.

What should I do?

I've been sitting on it for four hours and I'm in a black ass.