Ruhul Amin

read this to test the mysql connection in https://gist.github.com/chales/11359952

if the connection works, then the problem with your wordpress
if not, then the problem with you mysql server.
and of course check the if the mysql credentials are correct in wp-config.php

try deactivating your plugins and then activate one by one

1. first check mysql is up or not
2. try rename your plugins folder
3. create a new php file and test the database connection

did you try placing the following line in your wp-config.php?

define('WP_HOME','https://example.com');
define('WP_SITEURL','https://example.com');

use cloudflare and install w3 total cache, you will get google page speed score more than 70

why don’t you reset the password in database.?
generate a password here https://www.md5.net/md5-generator/ and reset in databse

i think your lost password link has been filtered by another function

your lost password link should be https://www.goldcoastphotostudio.com.au/wp-login.php?action=lostpassword

you have to change the domain name from database

try activating the default wordpress themes and deactivating all plugins

i see all images are exist, only logo is missing.
only re uploading will fix this. you have to upload and set the logo url from theme settings.