Hi! I think you should think in just do some nice LST, topping could not work fine in autos, and fimming in my opinion should not be do in autos because you can actually miss the fuck i missed and that will make your plant to waste time passing throw the stress for nothing and time is always couting on autoflowers. Try the LST, or maybe just a super cropping on the main branch and pinching braches and leaves lower than the 5th node so you can develop some nice top buds. It worked with me a time ago with one of my first autos. Keep it up!!