Romans 10:17,
Jude 1:20
"But ye, beloved, building up yourselves on your most holy faith, praying in the Holy Ghost."
Jude 1:20

The Bible reveals two ways in which our faith can be built up. In Romans 10:17, we are told that faith comes by hearing the word of God. When you read the word of God, you get quickened through the knowledge you acquire of who God is and what He can do. When you know what He had done in the past and know that He is the same yesterday, today and forever, you are quickened in your faith.
Build up your faith as the mustard seed which though it be the smallest of all seeds, yet it grows to a very big shrub and becomes a shelter for the birds of the air (Matthew 13:31-32). When you grow your faith, you will become a solution to people's problems.
You can also build up your faith by praying in the Holy Ghost, who will make intercessions for you, making you effective in your prayers (Roman's 8:26-27). Pray therefore to be diligent in reading the word of God and in effective praying, thus building up your faith.
May God help you.
https://bummyla.com/2017/12/19/son-of-god-build-up-your-faith/