Muhammad (ﷺ) supplicate to his Rabb by saying this:

اَللَّهُمَّ إِنِّي أَسْأَلُكَ خَيْرَ الْمَسْأَلَةِ، وَخَيْرَ الدُّعَاءِ، وَخَيْرَ النَّجَاحِ، وَخَيْرَ الْعَمَلِ، وَخَيْرَ الثَّوَابِ، وَخَيْرَ الْحَيَاةِ، وَخَيْرَ الْمَمَاتِ، وَثَبِّتْنِيْ، وَثَقِّل مَوَازِينِيْ، وَحَقِّقْ إِيْمَانِيْ، وَارْفَعْ دَرَجَاتِيْ، وَتَقَبَّلْ صَلَاتِيْ، وَاغْفِرْ خَطِيْئَتِيْ، وَأَسْأَلُكَ الدَّرَجَاتِ الْعُلَى مِنَ الْجَنَّةِ، اَللَّهُمَّ إِنِّي أَسْأَلُكَ فَوَاتِحَ الْخَيْرِ، وَخَوَاتِمَهُ، وَجَوَامِعَهُ، وَأَوَّلَهُ، وَآخِرَهُ وَظَاهِرَهُ، وَبَاطِنَهُ، وَالدَّرَجَاتِ الْعُلَى مِنَ الْجَنَّةِ آمِينْ، اَللَّهُمَّ إِنِّي أَسْأَلُكَ خَيْرَ مَا آتِيْ، وَخَيْرَ مَا أَفْعَلُ، وَخَيْرَ مَا أَعْمَلُ، وَخَيْرَ مَا بَطَنَ، وَخَيْرَ مَا ظَهَرَ، وَالدَّرَجَاتِ الْعُلَى مِنَ الْجَنَّةِ آمِينْ، اَللَّهُمَّ إنِّي أَسْأَلُكَ أَنْ تَرْفَعَ ذِكْرِيْ، وَتَضَعَ وِزْرِيْ، وَتُصْلِحَ أَمْرِيْ، وَتُطَهِّرَ قَلْبِيْ، وَتُحَصِّنَ فَرْجِيْ، وَتُنَوِّرَ قَلْبِيْ، وَتَغْفِرَ لِي ذَنْۢبِيْ، وَأَسْأَلُكَ الدَّرَجَاتِ الْعُلَى مِنَ الْجَنَّةِ آمِينْ، اَللَّهُمَّ إنِّي أَسْأَلُكَ أَنْ تُبَارِكَ لِي فِي نَفْسِيْ، وَفِي سَمْعِيْ، وَفِي بَصَرِيْ، وَفِي رُوحِيْ، وَفِي خَلْقِيْ، وَفِي خُلُقِيْ، وَفِي أَهْلِيْ، وَفِي مَحْيَايَ، وَفِي مَمَاتِيْ، وَفِي عَمَلِيْ، فَتَقَبَّلْ حَسَنَاتِيْ، وَأَسْأَلُكَ الدَّرَجَاتِ الْعُلَى مِنَ الْجَنَّةِ، آمِينْ

Allaahumma inni as’aluka khairal mas alati, wa khairad dua’a-i, wa khairan najaa’hi wa khairal ‘amali wa khairath thawaabi wa khairal ‘hayaati wa khairal mamaati wa thabbitni wa thaqqil mawaazinii wa haqqiq iimaani warfa’ darajaatii wa taqabbal salaatii waghfir khatii-atii wa as-alukad darajaatil ‘ulaa minal jannati. Allaahumma inni as-aluka fawati’hal khayri wa khawaatimahu, wa jawaami’ahu, wa awwalahu wa aakhirahu wa dhaahirahu wa batinahu waddarajaatil ‘ulaa minal jannati aamin. Allaahumma inni as-aluka khaira maa aatii wa khaira maa af’alu wa khaira maa a’malu wa khaira maa batana wa khaira maa dhahara wad darajaatil ‘ulaa minal jannati aamin. Allaahumma inni as-aluka an tarfa’a dhikrii wa tada’a wizrii wa tusli’ha amrii wa tutahhira qalbii wa tu’hassina farjii wa tunawwira qalbii wa taghfira lii dhambii wa as-alukad darajaatil ‘ulaa minal jannati aamin. Allaahumma inni as-aluka an tubaarika lii fii nafsii wa fii sam’ii wa fii basarii wa fi ruuhii wa fii khalqii wa fii khuluqi wa fi ahlii wa fii ma’hyaaya wa fii mamaati wa fii ‘amalii fataqabbal hasanaatii wa as-alukad darajaatil ‘ulaa minal jannati aamin

O Allah I ask of You the best request, the best supplication, the best success, the best work, the best reward, the best life, and the best death. And make me firm, let my balance (of good) be heavy, fulfill my belief, elevate my position, accept my prayer, and forgive my sin. And I ask of You the highest degrees in Paradise. Ameen. O Allah I ask of You the beginnings of good, and the endings of good, all its aspects, its first, and its last, its apparent (side) and its unapparent (side), and the highest degrees in Paradise. Ameen. O Allah I ask of You the good that comes to me, and the good of what I do, and the good of my work and the good of what I conceal, and the good of what I reveal and the highest degrees in Paradise. Ameen. O Allah I ask You to raise high my reputation, relieve me of my burden, set right my affairs, purify my heart, guard my chastity, illuminate my heart, and forgive my sin. And I ask of You the highest degrees in Paradise. Ameen. O Allah I ask You to bless me in my hearing, in my sight, in my soul, in my body, in my manners, in my family, in my life, in my death, and in my work and to accept my good deeds. And I ask of You the highest degrees in Paradise. Ameen.

Reference: Sahih (Haisami). Majma Al-Jawwat: 10/108