I am not able add new payment, after many attempts

What happens when you try? Error message(s)? More information would help. Payment method declined?

See the Apple Support article(s) below. Link to contact Apple Support in the article.

Apple ID payment information - If your payment method is declined, or you have a billing issue with a previous purchase in the iTunes Store.    

Possible fixes.   Fix ‘Your Payment Method Was Declined’ Error In App Store

                          Payment method declined in iTunes or the App Store ...