iPhone is not charging

Check your battery health in Settings>Battery>Battery Health & Charging>Maximum Capacity,

If the percentage is close to 83-80% your battery must be replaced, since it could have unpredictable behavior.

Also, if you already tried (to no avail) all the steps provided in this support article:--> If your iPhone or iPod touch won't charge , I suggest that you make an appointment (*) and have your device+charger+cable inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> https://locate.apple.com/choose-country-region . 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.

Read this article about what to do if your iPhone or iPod touch won't charge --> If your iPhone or iPod touch won't charge - Apple Support