Before the closing salām, make duʿā. The Prophet ﷺ taught that after the tashahhud and ṣalāh upon him, one should “choose whatever supplication he likes and make it.” (al-Bukhārī & Muslim). He commanded seeking refuge from four: the punishment of the grave, the trial of the Dajjāl, the trials of life and death, and the punishment of Hell.
العربية: عن عبد الله بن مسعود رضي الله عنه أنّ النبيّ ﷺ قال بعد التشهد: «ثم يتخيّر من الدعاء أعجبه إليه فيدعو». (البخاري ومسلم).
After the last tashahhud, before the salām, ask Allah for your needs of this life and the next.