Welcome to the community @Garuda-Development
This is a billing issue as it was stated in: https://community.atlassian.com/t5/Jira-Software-questions/Your-Atlassian-Cloud-site-is-currently-unavailable/qaq-p/2513574
The best option would be to downgrade to the free version, but since you cannot access the website, you would need to raise an Atlassian support ticket in order to solve this issue. Please follow the instructions from Trudy given on this page.
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