Chapter 12 · The Yoga of Devotion · Krishna said
Bhagavad Gita 12.9 — The path of practice
अथ चित्तं समाधातुं न शक्नोषि मयि स्थिरम्। अभ्यासयोगेन ततो मामिच्छाप्तुं धनञ्जय ॥
atha cittaṃ samādhātuṃ na śaknoṣi mayi sthiram | abhyāsayogena tato māmicchāptuṃ dhanañjaya ||
Meaning
If you cannot keep your mind steadily on me, then seek to reach me through regular practice, Arjuna.
In today's life
If focus does not come easily, a small daily habit of prayer or japa builds it over time.