Have constant activities from wake up to bedtime.
Don't stop for one second or be boring at all.
Have snacks all the time. Just had a meal. Doesn't matter. Snacktime.
Don't even think about naptime.
Unless you are in a car. Then naptime is ok.
Be okay with lots of crying and yelling.
Not from 3-year-0ld.
It's from you.
He will just laugh at you when you sob.