What is the bedtime for 3years old? My child comes from school at 6pm and only asleep by 10.30pm

Frankly speaking all kids have their own sleep timing. Doesn't mean one kid can sleep at 8pm means the other also must follow. As long as your child wakes up without being too cranky and tired then it's fine.

need to set routine. 830pm the child need to sleep. use sleep balms, white noise, make yr room dark.

Why can’t you as the parent, decides on this?