i reset my apple id password but i am not able to use the new password on my ipad mini?

Did you follow all the steps provided in this support article?:--> Change your Apple ID password - Apple Support

If the issue persists, contact Apple Support using this link:--> Contact Apple for help with Apple ID account security - Apple Support

Regards

Giulio

Having changed your AppleID Password, there are several critical actions that you should complete having done so:

What to do after you change your Apple ID or password - Apple Support