One option, having created the account, is to set it to be inactive - Bluesky does not expire inactive accounts after say 30 days as some other social media platforms do.
Mark
*Edit* Checked this and yes, this is still the case, inactive accounts are simply put on the shelf and are not at threat of deactivation.
https://bsky.app/profile/safety.bsky.app/post/3ku74woxysv2d