execute at @a[hasitem={location=slot.weapon.offhand,item=arrow},tag=!elza,name=(username)] run structure load ultimatekit ~~1~
tag @a[hasitem={location=slot.weapon.offhand,item=arrow},tag=!elza,name=(username)] add elza
execute as @a[tag=elza] unless entity @s[hasitem={location=slot.weapon.offhand,item=arrow},name=(username)] run tag @s remove elza