I think I understand what you're trying to say, and as a fellow advocate for freedom of speech, I am sympathetic to that cause. However, I think you are granting Twitter and Elon more credit than they are due in their role of "the preservation of free speech in modern society".
Free speech existed before Twitter, and even without Twitter can still exist. Elon the self-proclaimed "free speech absolutist" also compromises free speech when it suits his needs, usually financial. Elevating what Twitter was, what Twitter is, and what Twitter could be, beyond what it deserves, isn't very compelling to me. As long as The Constitution exists and our institutions still take it seriously, I really can't feel that much of a desire for Twitter needing to be the shield bearer for free speech.