Sheikh Al ‘Uthaymīn (May Allāh have mercy on him) said:

One of the things that has been narrated regarding the end of Ṣalāt (prayer) is to say “O Allāh help me to do remembrance of You, to thank You and to worship You well”; He said “Worship You well” and he did not say “Worship You a lot; He said “well”, because what matters is the quality of the worship. No doubt, if one can have both quality and quantity, that is better. [Sharḥ Mishkāt Al Maṣābīḥ 2/130]