“Consequently, faith comes from hearing the message, and the message is heard through the word about Christ” (Romans 10:17). God creates saving faith through the gospel in word and sacrament. God strengthens and preserves saving faith through those same means.
God increases faith and trust in him as you use his word and receive the Lord’s Supper. This is why God instructs us: “Let the message of Christ dwell among you richly…” (Colossians 3:16) This is why Jesus invites us to partake of the Lord’s Supper often (1 Corinthians 11:25).
I encourage you to be faithful in your use of God’s word at home and in church, and to be a frequent guest at the Lord’s Supper. Jesus is not interested in snuffing out weak faith; he wants to fan it into flame (Matthew 12:20). God bless your faithful use of his word and sacrament.