baby’s bedtime

my son is 7mo i’m trying to bring his bedtime down to a lower time. at least 8pm. everyday he goes to bed @11 that’s already the time he’s used to. so idk how to bring his bedtime down because if i put him down at 8 he’ll treat that as a nap. idk how to change his daily naps to make him go to sleep earlier or what to do at night time.