You must not pray nafl prayer for that, but supplicate a lot to Allah and make general duaa in your sujood and before tasleem in all of your prayers.

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Set a date in the Hijri calendar where you will estimate what you have in that date and give 2.5%, including the credits you have that is most likely coming.

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This is not permissible. Kindly refer to the following link(s):https://www.youtube.com/watch?v=IA1pLamGQ6g

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