Invocations after the final Tash-ahhud and before ending the prayer

اللَّهُمَّ أَعِنِّي عَلَى ذِكْرِكَ، وَشُكْرِكَ، وَحُسْنِ عِبادَتِكَ

Allāhumma aʿinnī ʿalā dhikrika, wa shukrika, wa ḥusni ʿibdatik

O Allah, help me to remember You, to thank You, and to worship You in the best of manners.