Hi! I just replied to your other question! I would suggest not to top or fim because you can stun the plant and since it's an auto it will not respond well. The best you can do is an LST and maybe try a scrog. A SOG is a good idea also but since it's a Sea Of Green you need many seedlings or clones to do it. If you have only one or few do an LST.
Happy growing and stay safe! 👍