Hi @Seyed,
Thank you for your reply! We have reviewed the main.log file you shared and we notice that during the site creation process it appears the connection to the database service is being denied. This can indicate that for some reason the root user password is out of sync, or not set.
A fellow DevKinsta user shared a solution that worked for them. Their instructions go through the process of resetting the root password of the database container. You may find a link to their instructions below:
Please let us know if resetting the database’s root user password helps resolve the issue, and allows the site creation process to complete.
If you do have any questions please let us know! We look forward to hearing from you!