First auto grow

Hi!
Never tried autos before, but this beauty is just bumping along. Anything I can do to boost yield?

Northern Lights from Dr Seeds
1 month, 15 days from seed
No nutrients at all, just water & Cal Mag
Topped once, little bit of LST
Happy Frog Soil
SpiderFarmer S1000 x 2

Using more nutrients would most likely make ur yield better too...but if u dont wanna use that just stick to what u have and do some good lst all the way to the end