We are called to serve Jesus' church through ministry and mission. Participation is a great way to connect relationally. Serving is always how we use the talents God's given us and find the gifts the Holy Spirit has gifted us with in Christ.
There are many ways fomr someone to get involved at Mystery. There's something for nearly everyone. You can scan the links under the "What We Do" section for places you can start serving. If you're in a community group you can also ask them for recommendations or for help connecting.
Involving yourself in the mission and ministry of your local church is also how God sanctifies us, making us more like Jesus. It is in giving ourselves we are challenged and changed most by the gospel.