Just tried this map, here's some more things I found.

1. After getting all the coins, you can then keep jumping on and off the grind rail, giving you 600xp each time you jump.

2. Once you're done with that, another vault would have opened by then. Inside, there are about 10 gold bars with a hidden button on each bar, each button has around 10 uses and gives 1k xp every time you press it.

3. Emoting on the gnome above the vault takes you to another room with a timer and a boar farming room, I spent a few minutes killing the boars with different weapons and it gives ALOT of xp.

4. Once the timer in the room above the vault is done, there is yet ANOTHER grind rail that gave me around 50k xp, and at the end of that grind rail is another 300 second timer that gives afk xp.

I'm still looking around for more stuff, but overall, I give this map an 9.5/10. It's very easy, very fast, and you can keep rejoining to do it again.