Prayer, zakah, obedience: the road to mercy.
Worship of Allah and kindness to His creatures
Right after the promise of security, the verse names the daily practice behind it. Ibn Kathir explains prayer is worshipping Allah alone, zakah is kindness towards His poor and weak creatures, and by these one obeys the Messenger ﷺ, so that Allah will have mercy.
You pray on the way to work, give a little on payday, and try to follow the Sunnah in small things. It does not feel like much. This verse says that is the road to mercy. One line upward to Allah, one line outward to people.
Mercy is something that will just happen to me.
Prayer, giving, and following the Messenger ﷺ are how I walk toward Allah's mercy.
Give a small amount to someone in need today, right after a prayer.