Just say whatever you would like to say to Satoshi.
I think the biggest thing we can say is thank you. Thank you for creating a new form of money, the one that isn't centralized and that allows participation of any people. Without you, there would not have been this community of tons of people who've been discussing Bitcoin and many other cryptos (which probably also would not have existed) every day for many years. Thanks for showing us that something that is not backed by a government or a huge company can actually not only survive but thrive. In return, I hope your privacy and wish to remain unknown will be respected because of course you, of all people, deserve to live your life in peace. I hope you're alive and perhaps even reading these messages somehow.
If he's still alive, i know he had witnessed the growth and development of his invention and he must be very proud of himself. Without him, we will still be stuck on fiat and would never experience the good thing about being decentralized. Satoshi may have left the forum 11 years ago but bitcoin managed to survived from all those threats from the government and all those negative criticisms made by people who don't even know what's the real value of bitcoin. As long as they know that bitcoin is decentralized, then its a way opposite to fiat and that's why the government is not approved with it.