Make the largest amount of gold
All the fun in Cronous is in the end game. The best gear, raids, , fortress sieges and so on. If you want to get to the top level follow this simple three steps Cronou leveling guide that can help you.
This is arguably the most important step. Each class has its strengths and weaknesses and in order to truly master Cronou you need to study them. In particular for this guide, you need to know the best way to make the largest amount of cheap Cronous gold with the least down time.
If your class has strong AOE spells you can use them to take down several mobs. On the other hand, some classes are better geared toward individual quick fights and the more damage you invest in individual blows the better.
Knowing your class is also about knowing which build is best suited for leveling. You can find this information in several guides throughout the Internet, though opinion may vary - in general builds that are geared toward increasing damage are best.
Finally, each class gets skill updates at certain levels. Know these levels and plan your trips back to the city accordingly. You do not want to waste time having traveling to the city to do something only to have to go back ten minutes later to upgrade your skills.