LINE App Next Button Not Working During Email Login

I am unable to access my old game account named Caloftadiy, which is linked to the LINE app. Although my game progress is connected to my LINE account, after typing my email address to enter my password, the arrow button in the bottom right corner of the screen remains unclickable and unresponsive, preventing me from proceeding to the next step.

Despite trying repeatedly for approximately 10 days, the exact same issue persists, making it impossible for me to log into my old account. Currently, I am being redirected to a newly generated account with random letters and no profile picture; I do not want this new account, I only wish to access my original account. This situation causes me significant distress regarding my lost game progress and time invested.

I request that the necessary technical investigation be conducted so that I can regain access to my original account, that a fix be provided for the unresponsive confirmation/next arrow button in the bottom right corner, and that my original account be manually restored to me if possible.