Do not attempt this on a production website, create a staging and try debugging there
1. Create a list with all the active plugins
wp plugin list --status=active --field=name > plugins.txt
2. Deactivate the plugins one by one and curl the HTTP response
awk '{print $1}' plugins.txt | while read a; do wp plugin deactivate $a --skip-plugins && curl -sILX GET https://staging.kipreos.me/ | head -n 1 && wp plugin activate $a --skip-plugins; done
The script will deactivate the plugins one by one and check the HTTP response. Once the plugin that creates the problem is deactivated you will see the curl check returning an HTTP/1.1 200 OK
response.
3. Enable again all the necessary plugins to restore the site to the previous condition
awk '{print $1}' plugins.txt | while read a; do wp plugin activate $a --skip-plugins; done