The worship leader’s voice cracking doesn’t ruin anything. God was listening to the heart, not the key.

Importing performance standards into a room that never asked for them ruins something. A cracked note is a problem at a concert, where the point is the sound, and it is not a problem in a room where the point is a few hundred people meaning something together. Perfection was never the entry fee. Trying in public while audibly imperfect is the braver act anyway.

Sing even though you are bad at it. Be visibly generous to the person who stood up and tried, and say something to them afterward rather than nothing.