Be the top of the high-score list. This takes a lot of work, though, because other people will be after you. Become the top player in your guild, or your race. Solve enough quests to make Wizard. This takes you out of normal gameplay and gives you special powers.
Wizards tend to write new areas for the game, or sometimes they just sit around and socialize.
Wyvern has several quests , and will eventually have dozens or hundreds of them, all created by users like you. However, sometimes you'll need to solve a quest in order to get a certain item or obtain membership in a certain guild, sect, or society. Lots of people get on MUDs with no specific goals in mind. Everyone gets something different out of the game. You should figure out what works best for you and stick to it.