My battery is not strong again,what can I do ?

Hey there! I am sure you are aware of these obvious pointers but I shall nevertheless state it here. Every device has a definitive battery life. With iPhones I am given to understand that it is approx. 500 charge cycles. You can go to Battery in Settings and check the Battery Health. If it is below well under 80% then I reckon it is time for you to change the battery at your nearest authorized Apple service centre. You can also check which apps causes maximum battery drain, by again visiting the Battery option in Settings. Appropriately you can chose to disable the background refresh of those applications which you really do not need to keep refreshing in the background as that also causes your battery to drain faster. Extensive use of Bluetooth and several hours of gaming and video streaming can too cause quick battery drain. Hope this helps!

oluwaseun ~ Does your iPhone 6 still have its original battery? ...If so, it's probably due for replacement:

iPhone Battery & Power Repair

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As others have already pointed out, it probably needs to be replaced.

That said, the iPhone 6 is obsolete. It's not worth the price of a new battery.

It's time for a new phone.