Error 503 Service Unavailable and wp-json/tdw/save_css

It appears to be an attempt to use a known vulnerability in the tagDiv Composer plugin (used in a couple of tagDiv themes. Read the linked article for more details.

Note: If you think your WordPress site has been hacked, start here: https://wordpress.org/documentation/article/faq-my-site-was-hacked/

If you’re using the tagDiv plugin or theme, make sure it’s all up to date. If you’re not using any of it, you might be able to stop the flood of attempts with a rule in your site’s .htaccess file:

RewriteCond %{REQUEST_URI} ^/wp-json/tdw/.*$ [NC]
RewriteRule ^.*$ - [F,L]

Note: This .htaccess code is untested and you should test it in a non-production environment before you put it into production.

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