Accidentally deleted main user

Hi I’ve just finished creating a wordpress website.
I’ve just added a new user (for the client) and set the privelages to ‘editor’ and logged out.
When I tried to log back in with my main log in, it won’t recognise it. I’ve tried clicking on ‘lost your password’ but is says user doesn’t exist!

I can log in to the dashboard with the new client log in I created but because I set their privelages to ‘editor’ I can’t add a new user.

I assume I must have deleted the main user by accident. How can I fix this? Thanks