Answered by Sayyidi Habib Umar bin Hafiz (may Allah protect him and benefit us by him)
Repeat La ilaha ill’Allah in abundance and recite 100 times a day:
رَبِّ اشْرَحْ لي صَدْرِي و يَسِّرْ لي أَمْرِي
Rabbi-shraḥ lī ṣadrī wa yassir lī amrī
“My Lord bring tranquillity to my heart and give me ease in my affair.” (20:25-26)