Won’t turn on - flashing apple logo

Hi! I have an old iPhone 7 Plus that hasn’t been used in a couple of years. I’m trying to wipe it to re-use but can’t get it to turn on, it’s charged for 24+ hours but is getting stuck at the apple logo and then going black again.

I’ve tried the force reset with the side buttons but the only thing that does is stop it flashing up the apple logo while I’m holding them.

I tried to connect to a laptop with iTunes but the device doesn’t seem to be registering.

Is there anything else I can try or is the phone dead for good?

thanks!