Genuinely thank you for sharing this. A lot of new people are starting and thinking they should get a 3"-5", not realizing how steep a learning curve/risky it is flying something that heavy/powerful vs a 15g-50g whoop. Or how different it is in sim vs real life, let alone real life and in goggle. Not saying you aren't experienced, just that it's good for people to hear this kind of thing.
If you do want some advice: slow down, lower the camera angle, use horizon/angle mode, limit the throttle and/or motors. Changing prop pitch and blade numbers can also make it easier to control depending on how youre flying. Also, if the motors support multiple battery cells/voltages, go with the least powerful. Like if it's a 4s-6s motor, fly it on 4s until youre used to it.
Just looked at a listing and it's recommending 6s, I'd interpret that and the "professional" designation to mean the drone intended for pretty experienced pilots. I love my voldador 3.5" on 6s, but they are very powerful and fly as such, I would 100% wreck them if I was starting out. I still wrecked one of them when I first built them and that was with a decent amount of experience. It's kind of a niche size/power combo.