Have you setup a DNS an A-record for non-www also known as @ ?
And since you’re using HTTPS, then you might want to redirect non-www for HTTPS too. If your certificate allows the non-www of course. And then we want to redirect www to HTTPS as well.

server {
        listen 80 default_server;
        listen [::]:80 default_server;
        server_name example.ca www.example.ca;
        return 301 https://www.example.ca$request_uri;
}
server {
        listen 443 ssl http2 default_server;
        listen [::]:443 ssl http2 default_server;
        include snippets/ssl-www.example.ca.conf;
        include snippets/ssl-params.conf;
        server_name example.ca;
        return 301 https://www.example.ca$request_uri;
}