My J3 Pro is completely dead

First off , my phone was working fine up until a few days ago when it started to take ages to charge my mind went directly to the charger so I tried it on a different J3 Pro and it charged just fine , I kept using it with the slow charging till I decided to factory reset it in order to reset the battery and I made a mistake by hard reseting it while the charge was 1 percent after that it wouldn’t even turn on , at the beginning the first charging sign shows but it doesn’t charge but after it stopped showing and now the phone is compeletly dead , What do you think is the problem guys and how can I fix it ?