Your relationship with God must come before other people's relationships with God.
Paul, who wrote half the New Testament, was deeply concerned about being "disqualified for the prize." This man preached to many and wrote Scripture, yet he knew how fragile he was. Preaching to others does not guarantee right standing before God. It's easy to get so wrapped up in "ministry" that it becomes more about the ministry than the God who makes it all possible.
It doesn't matter what we say about God if we never talk to Him.
I've noticed when I give real, emotional time in prayer to God, offering myself to Him, I have much strength to minister to others. But when I stop praying, feeling like I've "got it all together" I start to fade in passion and zeal. It's so easy to get caught up in what's going around us that we forget the invisible. We give so much attention to our lives, yet we neglect our relationship with the Father, the only part that really matters.
Whatever you need to do to nourish your soul, do it. Pray, really meditate on Scripture, read Christian books, have spiritual conversations, go by yourself in the wilderness, whatever. Sometimes taking a day off for a real Sabbath is healthy for the soul. And it's productive.
What will it matter if we convert the whole world, but everybody gets to Heaven but us?
5 days ago