Issue with setting up a custom domain for droplet

Hi! I am hosting my database (Pocketbase) on DO Droplet. I wanted to ensure secure connection so I set up a custom subdomain and have SSL certificate for it. I pointed my DNS using A record to Droplet IP (209.38.41.103). However, now I struggle with nginx set-up file. I used to get nginx welcome screen but now I get 404. I need to allow POST for emails (/api/collections/waiting_list/records) and GET for other collections (/api/collections/(artists|artworks)/records).

Pocketbase running: http://209.38.41.103:8090/_

Here is my /etc/nginx/sites-available/pocketbase file:

server {
    listen 80;
    server_name pocketbase.artdots.co;

    # Redirect all HTTP traffic to HTTPS
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl;
    server_name pocketbase.artdots.co;

    # SSL configuration
    ssl_certificate /etc/ssl/certs/certificate.pem;
    ssl_certificate_key /etc/ssl/private/private.key;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers 'HIGH:!aNULL:!MD5';
    ssl_prefer_server_ciphers on;

    # Add global CORS headers
    add_header Access-Control-Allow-Origin *;
    add_header Access-Control-Allow-Methods "GET, POST, OPTIONS";
    add_header Access-Control-Allow-Headers "Origin, Content-Type, Accept, Authorization";

    # Handle POST requests for waiting_list
    location = /api/collections/waiting_list/records {
        if ($request_method !~ ^(POST|OPTIONS)$) {
            return 405;  # Method Not Allowed
        }

        proxy_pass http://127.0.0.1:8090;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        # CORS for preflight (OPTIONS) requests
        if ($request_method = OPTIONS) {
            add_header Access-Control-Allow-Origin *;
            add_header Access-Control-Allow-Methods "POST, OPTIONS";
            add_header Access-Control-Allow-Headers "Origin, Content-Type, Accept, Authorization";
            add_header Content-Length 0;
            add_header Content-Type text/plain;
            return 204;  # No Content
        }
    }

    # Handle GET requests for images in artists and artworks collections
    location ~ ^/api/collections/(artists|artworks)/records {
        if ($request_method !~ ^(GET|OPTIONS)$) {
            return 405;  # Method Not Allowed
        }

        proxy_pass http://127.0.0.1:8090;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        # CORS for preflight (OPTIONS) requests
        if ($request_method = OPTIONS) {
            add_header Access-Control-Allow-Origin *;
            add_header Access-Control-Allow-Methods "GET, OPTIONS";
            add_header Access-Control-Allow-Headers "Origin, Content-Type, Accept, Authorization";
            add_header Content-Length 0;
            add_header Content-Type text/plain;
            return 204;  # No Content
        }
    }

    # Default location block for all other requests
    location / {
        proxy_pass http://127.0.0.1:8090;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

Could you point me to problems in my set-up?