There are so many things it could be.
Was your phone working fine before? Any signs of problems before?
It could be the battery hypothetically…but if you haven’t noticed issues with it,probably not.
It it could be a component issue,like the power ic chip(power control).
you may be able to hook it up to a recovery program on the computer. If it’s a software issue,maybe it would allow recovery.
Now,did the phone die first,or was the battery low?
Have you tried a different wall plug and usb?
have you taken the battery out and blown on the pins and reinsert it?
IF NOT,take the battery out,and hold the power button for 10 seconds. Release,then repeat. This drains any residual power in the circuit. Trust me,this works if that’s what the problem is.
batteries plus bulbs checks batteries for free. Sometimes phone repair shops in general will test batteries free of charge.
Please let me know how this works!