I've been working on https://doorbell.io since 2013, and although it had a slow start in terms of revenue it is making just shy of $2,800/month at the moment, still as a side project.
You might want to consider redirecting requests for your IP address to go to your domain name.
Something like:
server {
listen 443 default_server ssl http2 reuseport;
listen [::]:443 ssl http2 reuseport;
server_name doorbell.io;
# redirect IP address requests to https domain
if ($host = '192.241.177.143') {
return 301 https://doorbell.io$request_uri;
# you might want to use code 307 in place of 301 if you care about POST requests etc
}
}