Very quick suggestion. It's a minor change that takes a few minutes to fix. Change this sign to a hologram using holographic display. https://www.spigotmc.org/resources/holographic-displays-patch.1039/ I get that it isn't ''needed'' but it would look a bit mroe professional rather than this boring sign.
support, the devs already know how to do this as you can see at the lobby spawn, so it won't take long.
Support, this would be a great implementation. Right now, the sign that is there doesn't catch much attention, nor is it very exciting, and most cannot spot the parkour, therefore I agree with this suggestion; a holographic display would catch the eye of new players, and in my opinion, would seem more exciting. ~Porky ;)