Hi, I would like to update all my keyword labels via a .csv upload, however, when I try to upload the keyword file with the updated labels, I'm advised I don't have enough keywords left for the import. Am I using the correct upload tool or is there a way around this, please?

Hi, I'd like to update all my keyword labels in one go and I thought it would be easier to do this via a csv upload) however, when I try to upload the keyword file with all my existing keywords and the labels, it says I can't due to me reaching my keyword limit.
Am I trying to upload the labels with the wrong tool, or is there another way around this, please?