Growth in all aspects of our spiritual lives, including faith, is a key element of our walk in Christ.
Luke 17:5 The apostles said to the Lord, "Increase our faith!"
Mark 9:24 And straightway the father of the child cried out, and said with tears, Lord, I believe; help thou mine unbelief.
2 Thessalonians 1:3 We are bound to give thanks to God always for you, brethren, as is fitting, because your faith is growing abundantly, and the love of every one of you for one another is increasing.
2 Peter 3:18 But grow in the grace and knowledge of our Lord and Savior Jesus Christ. To him be the glory both now and to the day of eternity. Amen.
What restricts a person's spiritual growth is a lack of attention to God's word. What will help is to read the Word of God, daily, systematically and prayerfully.
1 Peter 2:2 As newborn babes, desire the sincere milk of the word, that ye may grow thereby:
Here is a link to a website that will help you in your daily reading of God's word. It has a system of readings and also comments on those readings from Bible students which will help you understand what you are reading: www.dailyreadings.org.uk
Here is another link to information that will assist you with this question: Getting to Know God
I hope you have found this helpful.