Bro just like you can't enter a bucket of water into a bottle just in a go, that's because the neck of the bottle is small. So in this case to charge faster your device must support fast charging.
Please perform the following step to resolve slow charging issue:
1- Charge the device with the original charger.
2- Follow standard battery charging procedure (charge a fully discharged the battery in Switch-off mode up to 150 mins).
3- Perform Interactive checks through the Samsung Members app (Samsung Members > Get Help > Interactive checks > charger/USB).
For further assistance, register your concern in Samsung members app (Open Samsung members app > click on “+“icon > send feedback > Error report/ Ask Questions).
