Mastodon has given me the option to control my own data and my own social experience. This is clearly in its infancy, but steadily maturing. I run my own Mastodon instance which will be a bridge too far for most people, but I'm open for anyone wanting to setup their own account. I'd love to host the "Nuclear Twitter" community on my instance.
Yes, you'd have to build up a social circle again. But with the promise this is going to be the last time ever. The fediverse isn't going anywhere. It is after all not fueled by corporate greed, with your privacy as their source of profits, but centered around people, funded by people, lived by people.
That is why I'm so adamant to be on Mastodon and why I will eventually close my Twitter account. You'd be wise to build your Mastodon account as well before Twitter makes that choice for you by ceasing to exist.