Here's how I would do it:
1. Use a pronounceable password generator to find a short, memorable name. Like this one set to all lowercase characters: https://www.lastpass.com/features/password-generator
2. Plug it into https://www.namecheckr.com/ (or similar tools) to see if it's available everywhere
3. Buy the .com, .co, any other domain that interests you and register on every social site you can (even if you don't plan on using it)
4. self host a blog on your primary domain and make the other ones redirect to it
5. set up google workspace email on your primary domain and alias the other ones to it as well
If you're publishing a tweet or blog post, post first to your site and then on social media, linking with a canonical tag if available.