A practical suggestion:
The Lord's Prayer is made up of a series of requests. First, about God's reign, then about our needs. Spend a little time meditating on the first line. When your attention begins to wander, move on to the next.
Holy be your name
Your kingdom come
Your will be done
Give us this day our daily bread
Forgive us our sins
Lead us not into temptation but deliver us from evil