That's why no significant migration to Mastodon will take place. Even if you do manage to lift and shift your bubble (you won't), you'll then find yourself in a calm and slow place where nothing happens.
For a bubble to exist and thrive, it needs a common enemy. With the enemy removed, it collapses. Everybody inside couldn't care if they never heard from you ever again. They were never a friend, just people who agreed.
If you want a group of like-minded people sharing stuff, there's a million options. Go to Discord, start a Whatsapp group, a subreddit, whichever. But that's clearly not the point. Hardcore Twitter users want their hot take to be heard in public, with "enemies" listening in.