If you're not afraid of falling hard (do remember that you aren't supposed to fall, just don't restrain yourself out of fear or so) and know of a straight road in a good state without much traffic: Go fast.
It's how I learnt it. If you go fast you don't have to worry much about balance and can get comfortable with the pedal movement. But don't go too fast, you still have to stop and steer a bit.
After a few times you should have an easier time with trying to ride properly.
I believe I was 6 at the time I learnt, perhaps physics have changed since then.