My apple pencil dropped it can be charge but cannot write I thought the tip is damage so I change a new tip it still cannot write but can be connect and charge

We, just users like you, cannot diagnose that issue remotely, sorry.

For your peace of mind, I suggest that you make an appointment (*) and have your device+pencil inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> Apple – Location Selector. After checking it out, they'll give you all the available options.

Regards

Giulio

(*) You can do it:

• Online:--> Genius Bar Reservation and Apple Support Options - Apple;
• Contacting a local Apple Store or AASP among the list provided above;
• Using the "Apple Store" app, available and downloadable from AppStore.