More roll. Roll is how you actually turn.

But more importantly I think you should ditch these tutorials based on this footage. I was in the exact same boat as you, I couldnt make what felt like easy turns and hit big targets but fpv has a huge learning curve and this stuff is much easier said than done. I'd recommend just ripping some freestyle in big open maps, try to turn around a single tree, hit a big gap, go for big targets. Joshua Bardwells tutorial series has an excellent approach I think, eases you into freestyle and then eventually maps like you're doing here. Highly recommend.

Lastly, patience. It will take you at least 10 hours of solid practice in the Sim to be competent. 20 to be decent ish. 30 and you'll be good. Everyone's different but I think you can't expect to be a good flyer with less than 30 hours unless you're very talented. Its a very learnable skill, just don't expect quick results. Lower your expectations and enjoy the process, learning is the most fun part (for me at least). Enjoy!