The thing that decides this is whether the account was deactivated or actually deleted - they behave very differently, so it's worth pinning down first.
If it was deactivated (suspended for inactivity but not purged), those are often recoverable. For a personal / unmanaged account, try logging in and running a password reset on the Atlassian login - a deactivated unmanaged account usually reactivates on the next successful sign-in. If it's a work account managed by a company, you can't self-restore it; your Atlassian org admin has to reactivate or re-invite you, so that's who to ask.
If it was genuinely deleted, the honest answer is harder. Atlassian only keeps the data for a retention window after deactivation - roughly 15 days on free and 60 on paid - and after that it's permanently gone and support can't pull it back. You deleted in May and it's now July, so if it was a true deletion you're most likely past that window.
Two things are usually still true even after a delete, though: the email address is released, so you can create a fresh account on it (it just won't carry the old group memberships or product access - an admin re-grants those), and any Confluence pages you authored aren't deleted along with the account. They stay in their spaces, just shown as a former user until you're added back.
Given the timing, I'd go straight to the source: open a ticket with Atlassian Support with the account's email and the deletion date, and they can confirm whether anything is still restorable. And if this was a company account, pull your Atlassian admin in at the same time - for managed accounts they hold the restore and re-invite controls, not you.
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