Always be reminded that Jesus should be the one that being boasted to others, not ourselves. Stay humble and keep your feet on the ground. Boast about God's greatness to others. This is also one way of spreading His love around you.
Let the spotlight turn to Jesus. All honor and glory should belong to Him. He causes everything to happen for good. He is the author of life so we should give reverence in His Name and Creation. Let His Name be known to the ends of the earth.
Submit yourself to the Lord. Before boasting about Him, you should come humbly into His presence. Have that Christ-like attitude, too. We may not be perfect but our lives should be a blessing to other people. You can't boast in Jesus while you're preoccupied with yourself. Surrender all to Him and He will bless you.