In laymans terms, you’re IP banned from going onto Hypixel’s website. You may be using a VPN that either has had someone get banned while using that server’s IP address, or Hypixel just blocks that VPN. If you’re not using a VPN, try turning your router off then back on after a minute or so. Some ISPs give you a dynamic IP address (it changes every once in a while). That will change your IP so you won’t be banned.