[Help] how to root SM-j320Y Galaxy J3 2016 Willing to pay

Can anyone help me with this Variant of J3? (SM-J320Y)
I can't find any tutorial how to root this Phone with SUpersu.
I used to root this with Kingroot but it gets unroot when restarted.
I am really willing to pay.
Please let me know.

Thank you so much.

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