"God turned the curse into a blessing."

Nehemiah 13.2

Next verse, "when they had heard the law, that they separated from Israel all the mixed multitude."

Currently, this site scribe is in waiting mode for an answer. What seems a curse at present really isn't if one will wait on His timing.  The truth is clear from verse 3. "Separation" is also much of God's direction in OT law and NT scripture.

Separation from sin.  Not that He always bases blessings on whether we obey or not but at least one can know the effort has been made to follow Him.  Peace will reign when His ways are followed and maintained as much as possible.  

[References to name a few: Prov 13.20, 1 Tim 5.8, 1 Tim 6.3-5, 2 Thes 3.6, 2 Cor 6.14-18]

It is indeed up to the Lord to turn your "curse into" a blessing.  However, it's usually via perspective.  What others may see as a curse, such as moving a long way from family, or leaving a familiar job, can actually be a blessing for a number of reasons.  You get to meet new people.  You may even learn a new skill you didn't anticipate. You will grow closer to God because you have to lean on Him more than when the comfort of family was near.  The truth is the cup "is always full," not half full or half empty.

You see His "mercies...compassions and faithfulness" are "new EVERY morning."

It's been said, "trust Him when you can't track Him."