What is your role in the kingdom? 

But in a great house there are not only vessels of gold and of silver, but also of wood and of the earth; and some to honor, and some to dishonor: 2 Timothy 2:20

The kingdom work is akin to a house full of valuable and non-valuable things. Just as you dispose of useless or non-profitable items same as our Heavenly Father cast out those that bear no fruits in his kingdom John 15:2 Every branch in me that beareth not fruit he taketh away: and every branch that beareth fruit, he purgeth it, that it may bring forth more fruit.

That is the reason why the Scripture urges us to be useful for the kingdom sake. 2 Timothy 2:21 If a man, therefore, purge himself from these, he shall be a vessel unto honor, sanctified, and meet for the master's use, and prepared unto every good work.

As a Christian, you have to play a part in the ministry and your role in the ministry might not be necessarily preaching but could be spiritual songs,  writing of spiritual books, the teaching of the word,  soul-winning, etc. these ministrations are what enhance the kingdom advancement.

Conclusion:

You have to be useful for the advancement of the kingdom of God. Let your part in God’s kingdom draw many to Christ.