Say you are given a small device with a single button. One long, hard, intentional press of this button will see you reset the world to the point of your birth. You will be reborn as the opposite sex of what you currently are now.
What you do with this new life is up to you. How the world will change in response to you being the opposite sex will be exactly as chaos theory as you think. Your parents are the same- and even give you whatever appropriate name is closest to your current (Gerald becomes Geraldine etc) You'll keep the memories- but I won't bet on your newborn baby mind to be able to hold onto much at all going forward. If you're non-binary, you'll be born to the sex that is further from what you present.
What will happen to the world you leave behind? No idea. Afterlife? Again, no information given. Will it be a better life? 404, answer not found. Just your birth will be the same, just you are the opposite sex.
Do you press it?
2 more extra scenarios can be added though:
1) You are allowed to keep this button for the rest of your life. At any time, for any reason, you could potentially decide to go ahead with the reset. Unless you lose the device, I guess (it won't work for anyone else). Do you press in this scenario, and why?
2) You are informed that you have pressed this button before. That you are already living in a reset timeline, where you have swapped sex. Does this make you press it?