What practical thing can EVERYONE do, no matter what their spiritual state, to become a saint?

What practical thing can EVERYONE do, no matter what their spiritual state, to start to become a saint?

Audio: http://www.orthodox.net/sermons/pen-sun-01-2023+a-practical-thing-everyone-can-do-to-become-a-saint.mp3
Video: https://youtu.be/AdCGO9lS8zo

Many of us are burdened by our sins and may not be able to pray well, don’t read the Bible very often, and other things that we know we should be doing but for some reason we don’t do . How can we be saved? It’s real easy if we concentrate on doing one thing that everyone can do no matter what their spiritual state is, or how much they pray, etc. And the wonder is that the more we do this thing, the more everything gets better. “But many that are first shall be last; and the last shall be first.” Mat 19:30

A clip (from 8:18 – 14:49) from the sermon on Pentecost, 2023 (https://youtu.be/F5ueLVemLjY, Audio: http://www.orthodox.net/sermons/pen-sun-01_2023+becoming-a-saint.mp3)