Frozen on startup without home buttom

Did you change the battery because the phone went flat and you didn't charge it?

If yes check charging port for debris blockage and use some tool carefully to clean it out if it's blocked.

If it's clean and plugs in properly then it's most likely a U2 Tristar charging ic chip gone on the logic board which goes bad if a car charger was used with a cheap aftermarket lightning cable (non-MFI certified).

You can test chip by unplugging battery, plugging it back in then plug the charging cable in. If it turns on itself with apple logo then chip is probably fine. If it doesn't turn on itself and you need to hold power button to turn it on then its probably the chip.