An interesting, an expensive and an amusing attempt to get a celeb's attention. The law doesn't allow profiting from a celebrity's exact match domain name. I'm not a legal guy and don't remember seeing such a use so I don't know if this letter qualifies as that or not. You'll get attention and maybe this'll reach Elon. He'll either be amused, sue you or decide to partner with you. The third option seems very unlikely.
I think my main problem with your letter (besides the length) is that you don't seem to be offering any value to Elon besides being the guy who bought a domain and wrote an amusing letter. Had you been a great artist with impressive and meaningful art, this would have been much more interesting, IMO. The entire world and its sister are now trying to mint anything under the sun. Elon can mint any NFT he wants, it'll be a hit and he can donate all the profits to any cause he wants so why should he mint a video of you fist pumping strangers or a blue circle? Because you bought an expensive domain, wrote a similar tweet 8 years ago and have an idea about a mostly non-profit business revolving NFTs? Don't know, man. This is the age of entertainment and crazy things can always happen, but the likeliest scenario is that you spent a whole lot of money on a publicity stunt. Good luck though. Gonna be interesting to see how this story unfolds.