Therefore once you become a believer, you are already a king and this implies that the advice given to Lemuel applies to you.
If we look into that advice, there was a reason for that advice which is so that the king will have a sound mind to give Judgments. This means that alcohol or wine denies one sound mind.
And as Christian, we ought to have a sound mind at all times. Other references include where the scriptures suggested that we should give alcohol or wine to fools so they can drink and forget their sorrows.
If we carefully examine this passage, we will understand that as Christians, we cannot be fools and this automatically exempts us from wine. We were equally encouraged to be filled with the HolySpirit and not in the wine