This doesn't exchange any private information between us, just gives you a neat new custom handle.

As changing your handle does vacate your existing"bsky.social" handle I recommend you create an alt-account to squat on your old handle and points to your new "blksky.social"

The basics are in your account settings you can create a a custom handle if you have your own domain.
I have just such a domain.
You pick the handle you want (ex. "name.blksky.social), and send me the DNS verification value, and I'll get you setup.

Updating your handle will keep all your posts.