I already have a jump in place. I just want my character to move more on the x axis when i jump.

Welcome to the forums @Odysst!

If you want to move further on the X axis, you can add some to the velocity on the X axis to go further. If I understand how the code above works, this should give a bit more horizontal force for longer jumps.

# other code above
var Jumping = Input.is_action_pressed("Jump")
if Jumping && onGround:
	velocity = Vecto2(velocity.x, JumpForce)
	# add extra X velocity in the direction of the X velocity
	velocity.x += 40 * velocity.sign()
	local_Hold_Time = Jump_Hold_Time
elif local_Hold_Time > 0:
	if Jumping:
		velocity = Vector2(velocity.x, JumpForce)
		# optional - add extra X velocity over time
		# velocity.x += 40 * velocity.sign()
	else:
		local_Hold_Time = 0
local_Hold_Time -= delta
a year later