Concentration in prayer is a result of a number of things such as your knowledge, your commitment to Islam and your lifestyle.
Therefore, there isn’t any easy way for reaching this high level of submissiveness. You have to learn more about Allah and His beautiful attributes. You have to learn more on how to perform your prayer as the Prophet salla Allahu alaihi wa sallam used to do so. Following the Sunnah in your prayers to the letter increases your concentration.
Preparing yourself for the prayer ahead of time and not cornering yourself until the last moment, this gives you more room and time to concentrate more.
And Allah knows best