This is Imam al-Haddad’s Prayer for Strength. Habib Umar bin Hafiz recommends reciting it regularly.
(اللَّهُمَّ يا رَبُّ يا قَدِيرُ يا قَوِيُّ يا مَتِينُ (ثلاثاً
أَسْأَلُكَ بِقُدْرَتِك وبِقُوَّتِكَ أَنْ تُمِدَّني في جَميعِ قِوايَ وجَوارِحِي الظَّاهِرة ِوالباطِنة ِبِقُوَّةٍ مِنْ قُوَّتِك َوقُدْرَةٍ مِنْ قُدْرَتِكَ أَقْدِرُ بِها وأَقْوَى بِها على القِيامِ بِما كَلَّفْتَنِي بِهِ مِنْ حُقُوقِ رُبوبِيَّتِك ونَدَبْتَنِي إِلَيْهِ مِنْها فِيما بَيْنِي وبَيْنِكَ وفِيما بَيْنِي وبَيْنَ خَلْقِكَ وعلى التَّمَتُّعِ بِكُلِّ ما خَوَّلْتَني مِنْ نِعَمِك الَّتي أَبَحْتَهَا لي في دِينِك ويَكونُ كُلُّ ذلِكَ على أَصْلَحِ الوُجُوهِ وأَكْمَلِها وأَحْسَنِها وأَفْضَلِها مَصْحُوباً بِالعَافِيةِ والقَبُولِ والرِّضى مِنْكَ يا أَرْحَمَ الرَّاحِمين
O Allah, O Lord, O Omnipotent, O Most Powerful, O Most Firm (three times).
I ask You, through Your ability and power, to bolster my inward and outward strength, giving me the ability and strength to perform the things which You have charged me to perform which pertain to the rights of Your lordship;
And to perform what You have encouraged me to perform, whether this pertains to my relationship with You or my relationship with Your creation;
And to enjoy every one of the blessings that You have bestowed upon me, which You have made permissible to me in Your religion;
And that all this be in the best, most beneficial and perfect way, accompanied by well-being, acceptance and Your good pleasure, O Most Merciful.