Remain seated after obligatory prayers
Shaykh ʿAbd al-ʿAzīz ibn Bāz رحمه الله mentioned:
The sitting after the taslīm in the prescribed prayers is from the most important times, in which the mercy of Allāh descends (upon his slaves).
Do not hastily get up, rather seek forgiveness from Allāh, glorify Him, praise Him, and magnify Him.
Ibn Baṭṭal (رحمه الله) said:
Whoever has many sins and desires that Allāh remove these sins from him without burdening himself, then let him seize this opportunity and remain seated in his place after the prayer, so that he may take advantage of the supplications from the Angels and their asking forgiveness for him.
Source: Sharḥ Ibn Baṭṭal, vol. 3, pg. 114 Translated by: Munīb al-Sumālī