Jump pack jump height how to make it jump higher?

here’s my code…

ITEM.Name = ‘Jump Pack’
ITEM.Price = 5000
ITEM.Model = ‘models/xqm/jetengine.mdl’
ITEM.Bone = ‘ValveBiped.Bip01_Spine2’

function ITEM:OnEquip(ply, modifications)
ply:PS_AddClientsideModel(self.ID)
end

function ITEM:OnHolster(ply)
ply:PS_RemoveClientsideModel(self.ID)
end

function ITEM:ModifyClientsideModel(ply, model, pos, ang)
model:SetModelScale(0.5, 0)
pos = pos + (ang:Right() * 7) + (ang:Forward() * 6)

return model, pos, ang

end

function ITEM:Think(ply, modifications)
if ply:KeyDown(IN_JUMP) then
ply:SetVelocity(ply:GetUp() * 6)
end
end

how do i make it so the players jump higher?

Where it has
[lua]ply:SetVelocity(ply:GetUp() * 6)[/lua]
change the 6