1. Would you dare to appear in public?
Not after everything that happened, it could be that after I reveal myself, you will find me dead the next day.
2. Would you move 1M BTC and sell for USD?
No, I will let it stay there forever, do you think Satoshi is that stupid to only have that 1M Bitcoin (BTC)?
3. Would you participate in the development and upgrade process of Bitcoin blockchain?
Times are getting more sophisticated over time, people might easily find me if I'm still involved in development, it's another matter if I participate in development without using my pseudonym.
4. Would you agree to accept the invitation to El Salvador?
Hey, I already said I don't want to reveal myself to the public, so the answer is "Not at all".
5. Wouldl you continue to stay anonymous and observe the development of Bitcoin?
Yes, like Satoshi doing now (probably).
6. Would you reveal this secret to your children before you die?
Here it has its pros and cons, but I would go to "I will tell my child that I'm Satoshi before I die". After I destroyed all the archives I had about Bitcoin (BTC), because maybe one day it would be dangerous for my child.
No discussion about Altcoins in this topic, so I think it would be better if you move it to
Bitcoin Discussion. That will get you more answers from the best people on this forum.