Contentment doesn't mean stasis and is completely compatible with sailing off to investigate new unknown countries, doing scientific research and generally being. actively curious about the world. I have been content with my life for most of the time since adulthood, but it didn't stop me studying and exploring subjects that interested me, being ambitious and making progress in my career.
Contentment is a secure platform from which to jump to achieve the impossible.
Happiness is an ephemeral emotion, to comes at times when life just gets suddenly very special, seeing a family member after absence, hearing exam results, achieving success at work or in private life. It comes, floodlights life for a few hours, occasionally longer, then goes.