Hello Everyone,
Thank you all for your cooperation in providing a solution.
— @beylasecke To complete @kraaieboutje’s reply, if you cannot access the wp-admin page, there are other ways to deactivate plugins: https://www.ads-software.com/support/article/faq-troubleshooting/.
Summary: you can using FTP/sFTP and rename the current theme from root of the website / wp-content / theme / {{current theme name}} and deactivating any plugins with rename plugin folder(e.g, add -t) from root of the website / wp-content / plugins {{Plugin Name}}
Also, check this link: https://www.ads-software.com/support/article/faq-troubleshooting/#how-to-deactivate-all-plugins-when-not-able-to-access-the-administrative-menus, or this link: https://kinsta.com/knowledgebase/the-site-is-experiencing-technical-difficulties/.
To see the error on WordPress, you can check the super administrator email; Or turn on the WordPress debugger mode. To enable it, please follow the steps explained in this link: https://www.ads-software.com/support/article/debugging-in-wordpress/.
Then please share the error message here as a code. We’ll find out what happened on your website with that error message.
After fixing the error, please tell us a little about the versions of plugins you use. To do this, please go to WP Dashboard > Tools > Site Health > Info Tab and click on the button Copy site info to clipboard. You can send the information as code here or upload them to https://pastebin.com/ and get an exclusive link.
Note 1: You can ask your host provider to return the backup.
Note 2: To download the latest version of the theme and Ocean Extra, please navigate to the following links:
https://www.ads-software.com/themes/oceanwp/
https://www.ads-software.com/plugins/ocean-extra/
Please let me know if you have any questions about the above steps.
Please keep us posted.
Best Regards