Stir Up the Good Inclination
Reish Lakish lays out a step-by-step plan for a person facing the yetzer hara.
Reish Lakish teaches that a person should always stir up his yetzer tov (good inclination) against his yetzer hara (evil inclination), as the verse in Tehillim says: Tremble, and do not sin. If he overcomes it, good. If not, he should learn Torah, for the verse continues: Speak in your heart. If he overcomes it, good. If not, he should say Krias Shema, as the verse continues: Upon your bed. If he still has not overcome it, he should remind himself of the day of death, as the verse ends: And be still. Reish Lakish, who knew from his own life how strong the pull of the yetzer can be, does not offer a single weapon but a ladder of them. When one step does not work, a person does not give up; he reaches for the next.
Source: Gemara Berachos 5a (on Tehillim 4:5)
Think of one struggle that comes back again and again, such as anger in the evening, wasted time on your phone or a word of lashon hara. Write down three steps to take when it arrives: first, pause and remind yourself who you want to be; second, open a sefer or a Torah recording for five minutes; third, say the first pasuk of Shema slowly. Keep the list where you will see it.