How can I get my baby to sleep?

Okay moms. I have a 19 month old son, he’s very active but he doesn’t want to sleep. He takes a 15-30 min nap during the day. I have tried putting him to bed at 9 he will wake up around midnight like he’s had a full nights rest. I’ve tried putting to to sleep at 10:30-11 and he wakes up at 4 AM ready to play. I’m one tired mom and have ran out of options. He fights any sleeping aid medication.