scoreboard players tag @a[tag=!LobbyJump,x=500,y=111,z=471,r=1] add InitLobbyJump
title @a[tag=InitLobbyJump] actionbar ["",{"text":"You ","color":"aqua","bold":"true"},{"text":"started ","color":"dark_aqua","bold":"true"},{"text":"the jump! ","color":"aqua","bold":"true"},{"text":"(take the right path to reach the end)","color":"aqua","italic":"true"}]
execute @a[tag=InitLobbyJump] ~ ~ ~ playsound minecraft:block.note.pling ambient @s ~ ~ ~ 2 0
scoreboard players tag @a[tag=InitLobbyJump] add LobbyJump
scoreboard players tag @a[tag=InitLobbyJump] remove InitLobbyJump