You should have received an email and a notification with more info in Creator Studio. Take a look at those resources and note that you can always reapply for the YouTube Partner Program again in 30 days.
@TeamYouTube Dear Sir,
Monetisation on my account has been disabled,please look over my Monetisation problem and please re-enable my Monetisation settings.
Thank Youpic.twitter.com/9RxYvfeXgi
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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