The Prophet asked: “Shall I tell you something that is the best of all deeds, constitutes the best act of piety in the eyes of your Lord, elevates your rank in the hereafter, and carries more virtue than the spending of gold and silver in the service of God, or taking part in struggle and slaying or being slain in the path of God?” His companions said: “Yes!” He said: “Remembrance of Allah.” (Recorded in Ahmad, Tirmidhi, and Ibn Majah)
So a simple practice to earn tons of blessings is to say “SubHaanAllah wa BiHamdihi SubHaanAllahil ‘Azeem” whenever you remember to say it. This means: Glorified is God and praised is He”
and “Glorified is God the Most Great”.
I like to say this anytime I can, such as when I’m washing the dishes.
Our Prophet (pbuh) said in a famous hadith:
Two statements are light on the tongue, weigh heavily in the balance, and are loved by the Most Merciful One: “Glorified is God and praised is He”
(Subhaanal-laahi wa bihamdih) and “Glorified is God the Most Great” (Subhaanal-laahil-‘Adheem).
(recorded in Al-Bukhari (7/168), Muslim (4/2072))
Saying this dhikr whenever you remember to say it will help you to focus more on your prayers. How? Well, when you learn to pay attention to your mind and your thoughts, you learn to control your thoughts more. You become a leader of your thoughts. The more you practice watching your thoughts (so that you remember to say this blessed dhikr), then the more you will be aware of your thoughts during your 5 daily prayers.
This type of “thought awareness” is called “mindfulness” in counseling. “Mindfulness” is “a mental state achieved by focusing one’s awareness on the present moment, while calmly acknowledging and accepting one’s feelings, thoughts, and bodily sensations.”
So when you train yourself to be more “mindful” of your thoughts (so that you remember to say this dhikr), you will be more “mindful” in general and your thoughts will wander less during your prayers, insha’Allah.