Try to switch on your phone if it works then it has battery issue so replace it. If that won't work, then there may be chances of motherboard or OS damage issue so you need to contact your nearby service center or trusted mobile repair shop

try cleaning your speakers. if it doesn't work change speakers.

try changing your charging cable with a good quality wire that supports a 3A current. if it still doesn't work contact the service center or nearby exclusive store.

1, check if the charger is working or not. 2, check is the micro USB charging cable is working or not. 3, check if the phone's charging ports are broken. if any of this is broken change it, you can use another phone or change with 18w of changing. if everything is in good condition then you need to check if there is a problem in the motherboard.

First, check if the battery is bloated or not if it is bloated change it with a similar 4500mah battery. If the battery is not bloated first change the app's background running setting to off from setting and stop other background processing you don't want. Next, stop all unnecessary notifications and turn on the dark mode it boosts your phone battery life. If it didn't work try replacing the battery and check if that resolves the problem.