Messenger of Allah ﷺ used to give up a good deed, although he loved to do it, for fear that people might act on it and it might be made compulsory for them. The Prophet ﷺ never prayed the Duha prayer, but I offer it.
إِنْ كَانَ رَسُولُ اللَّهِ ﷺ لَيَدَعُ الْعَمَلَ وَهْوَ يُحِبُّ أَنْ يَعْمَلَ بِهِ خَشْيَةَ أَنْ يَعْمَلَ بِهِ النَّاسُ فَيُفْرَضَ عَلَيْهِمْ وَمَا سَبَّحَ رَسُولُ اللَّهِ ﷺ سُبْحَةَ الضُّحَى قَطُّ وَإِنِّي لأُسَبِّحُهَا