This means a significant portion of your channel doesn’t meet YT monetization guidelines and policies–based on your current channel activity. Keep uploading original content and building an audience – you can always re-apply in 30 days from when you received the decision email.
Now, do I have to delete all the videos that I produced and made money from, for two years? My old videos are already authentic content. YouTube said that if I make videos with authentic visuals and sounds then they will activate my channel's monetization.