If you want your youth ministry to be keep growing, you need to keep growing. Seek God yourself. And not just for a sermon, but for an encounter. Your habits and convictions will inevitably set the culture in your youth ministry. You can't take your teenagers to a place you've never been. So never stop pursuing the presence of God yourself. You're a Christian, before you're a Pastor. 

Did you know it's possible to spend your life serving God and end up not really knowing Him? It's possible to build a big Church, big youth ministry or big online platform and completely forget who it's all really for. It's possible to walk out your journey of faith and actually leave Jesus behind (Seriously Jesus' own parents did. Check out Luke 2:43). And at times I have too. At times I have thrown myself so passionately into serving God, that I have neglected pursuing Him.