As we grow in our faith, God wants us to do things for Him:
# 1: Pursue Christ-like-ness: [This is between us and God]
# 2: Preach the gospel: [This is between us and the world].
The "great commission" is found in Matthew 28:19:- "Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost; Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you always, even unto the end of the world. Amen." God wants you to spread the good news about Jesus Christ. As you would have learned by now, everyone is lost - headed for hell - unless they repent and put their trust in Jesus Christ.
This does not mean we shout in the ears of everyone and anyone. As with all of God's work, preaching the gospel needs to be done with God's guidance. Spending time with God enables us to recognize His promptings.
# 3: Serve in a local church: [This is between us and our fellow believers]
Simply being part of a church involves activity. The Bible records that the Jerusalem church met for the breaking of bread, teaching of the apostle's doctrine and prayer (Acts 2:42 - these would be a Sunday service of the Lord's Supper, Bible Study and Prayer Meeting in modern parlance). They evidently also did evangelism together as a church. When you first joined a church, you had to be served. You had to be baptized, nurtured and helped along in your Christian walk, much like a new born baby has everything done for him by others in the family. As a baby grows up, he is able and expected to contribute to the family. In the same way, God has work for you to do in the service of other believers:
"Now there are diversities of gifts, but the same Spirit. Now ye are the body of Christ, and members in particular. And he gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers; For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ: Till we all come in the unity of the faith, and of the knowledge of the Son of God, unto a perfect man, unto the measure of the stature of the fullness of Christ:" - 1 Corinthians 12: 4, 27; Ephesians 4:11-13
God has given everyone one or more spiritual gifts, and He expects us to use them. The purpose of spiritual gifts is the edification (building up) of God's church. Ask God to guide you on how to serve in your church. Some may be called to clean up the meeting room, others to handle the finances, preach God's word, and so on.