Hi, Sorry if any of these ideas have been said already. Don't have enough time to read all the previous suggestions. Here are my few ideas on how you could make the server slightly better.
1. The Hedge maze from The Goblet of Fire- This could be a way to get galleons and/or xp and have flubberworms or other mobs in there (Possibly ones that do damage to you) Maybe you would have to be year 2-3+ to enter? And at the end/middle or where ever, there would be a sign that gives you money, xp or even some special trophy-like item.
2. Now, this one I know has already said. But it's just like the most amazing idea ever. Quests, I know these could distract from class but hear me out.
-Could be part of class, for example: If there was going to be a potions class later on that day that required ingredients, you could go on the quest to collect them from various locations throughout the castle. Saving money and helping players learn their way around the castle better.
-Could unlock certain rooms in the castle or around London. You could do a quest where you have to find a number of things in the castle, when you have found all of them you could unlock a special room or shortcut somewhere.
3. Minigames, I know you are already working on some minigames from the server, but here are some ideas for them
-Parkour
-Mob arena, where you have to see how long you last in the mob arena
-Dueling system, I know there is already dueling areas throughout the castle. But they don't get used enough in my opinion. There could be rewards for winning duels?
4. Characters found around the Castle, you could find well known students around the castle who help you find your way. Like if you were looking for Hagrid's hut, you could click on 'Hagrid' and he would tell you where it was. (This is probably the least helpful idea but someone might see where I'm coming from and make it better )
Thanks for reading, Hope these ideas helped. <3
-Kitty x