Maybe you are feeling soul-dry, mind-distracted, bone-tired. Summer “schedules” have a temptation toward less structure and a looseness of purpose, while weeks during the school-year have a different problem of weariness trying to keep up.
As for living sacrifices getting up on the altar, we must not hold back. We are prohibited from a lazy zeal (Romans 12:11). And while that requires repentance, it also promotes prayer. Do you know who desires that you would run to win more than Paul (1 Corinthians 9:24)? It is the same One who hears, and delights to answer, prayers.
“This is the confidence that we have toward Him, that if we ask anything according to His will He hears us” (1 John 5:14). Is it God’s will that you be zealous for Him? Yes. So ask, knock, seek, that He would continue working zeal into your spirit.
Even as we gather around the Lord’s Table, the Lord gives His people strength. He reminds us of Christ’s zeal in obedience and sacrifice, He encourages us with unity as Christ’s Body, and He equips us rejoice in hope.