If you have access to your cpanel then try to find the IP of your server or contact the hosting company and they can give you IP-based access to your WP website. it can be something like http://220.127.116.11/~ozlanJca/
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My assumption is you have assigned your domain which was previously bind to WordPress site to your Shopify site. If that is the case, your Wordpress site cannot be accessed anymore. You should have assigned a different domain name to your WordPress site before changing it to Shopify.