Domain records not working / website down

I host this website simonkarim.com on ultahost and put the domain records here on cloudflare. the domain is linked to the server, but it does not work. can you please tell me why?

You have a DNSSEC issue…
https://cf.sjr.org.uk/tools/check?7a10072b7bf5422da9ee73772a01186b#dns

You need to either disable DNSSEC at your registrar, or enable it at Cloudflare and copy the DS records to your registrar from your dashboard here…
https://dash.cloudflare.com/?to=/:account/:zone/dns/settings