Check the database as described here to see which user names and email addresses are stored and change the password as described: https://wordpress.org/documentation/article/reset-your-password/#through-phpmyadmin – If you need help accessing phpmyadmin or a similar application, contact your host’s support team.
I’ve checked phpmyadmin. My username and another member of my team are no longer listed.
Other names? Then the project was probably hacked. My recommendation: first read this article:
FAQ My site was hacked
After that I would recommend checking whether you still have a clean backup. If necessary, ask the support of your hoster. If so, delete all files and the database and restore the backup. Then change all access data in the hosting (also FTP, hosting login ..).
So if you still have a clean backup of your website, use that.
If you don’t have that, you can also hire someone to clean and secure it for you. However, this usually costs quite a bit of money (and time for you if you try it yourself). You can find offers for this online or you could ask here: https://jobs.wordpress.net/
Finally, you should secure your project. This is described in more detail in the article here: https://wordpress.org/documentation/article/hardening-wordpress/ – this way, you can protect your project against further attacks.
