If everything is running well in your life, it doesn’t mean you’ve to sit down and do nothing. Finding yourself comfortable is the best time to learn new things.
Even if you’re in a job that doesn’t require upgradation, you must not sit still. Jump out of your comfort zone and think about creating something new.
You can think about a startup. Learn to earn by trading and investing.
You can learn coding or writing. Read a good book to increase your knowledge base. Think of something larger than life. Believe me; you’ll not regret your thought and experience.