Why is my phone not turning on

So my phone was working perfect until my charger broke and it it completely died I got a new charger and it showed it was charging for a few second then my screen went black and I can’t even hard reset or connnect to apple iTunes so I got the battery replaced it turned right on with the new battery but it wouldn’t charge the guy said I needed a new charging port so a month later I went back and got the charging port fixed too now it still won’t do anything and I had it plugged in over night with an apple charger please help my phone is barely over a year old