Dedicating your whole duʿāʾ for the ṣalāt on the Prophet ﷺ will alleviate worries and become a means of forgiveness
Ubay said that I said, "O Messenger of Allah! I send a lot of Ṣalāt upon you. How much of my Ṣalāt should I make for you?" He said, "As you wish." I said, "˹How about˺ a fourth?" He said, "As you wish, but if do more, it would be better for you." I said, "˹How about˺ one-half?" He said, "As you wish, but if you do more, it would be better for you." I said, "Then ˹how about˺ two-thirds?" He said, "As you wish, but if you do more, it would be better for you."
I said: "Should I make all of my ˹duʿāʾ as˺ Ṣalāt for you?" He said, "˹If you do this˺ it would be sufficient for your concerns and it would be forgiveness for your sins."
قَالَ أُبَىٌّ قُلْتُ: يَا رَسُولَ اللَّهِ، إِنِّي أُكْثِرُ الصَّلاَةَ عَلَيْكَ، فَكَمْ أَجْعَلُ لَكَ مِنْ صَلاَتِي؟ فَقَالَ: «مَا شِئْتَ۔» قَالَ قُلْتُ: الرُّبُعَ؟ قَالَ: «مَا شِئْتَ، فَإِنْ زِدْتَ فَهُوَ خَيْرٌ لَكَ۔» قُلْتُ: النِّصْفَ؟ قَالَ: «مَا شِئْتَ، فَإِنْ زِدْتَ فَهُوَ خَيْرٌ لَكَ۔» قَالَ قُلْتُ: فَالثُّلُثَيْنِ؟ قَالَ: «مَا شِئْتَ، فَإِنْ زِدْتَ فَهُوَ خَيْرٌ لَكَ۔»
قُلْتُ: أَجْعَلُ لَكَ صَلاَتِي كُلَّهَا؟ قَالَ: «إِذًا تُكْفَى هَمَّكَ وَيُغْفَرُ لَكَ ذَنْبُكَ۔»