I have erorr 1020

But, have you applied something from the these steps?
Is that error related to your domain/website or Cloudflare dashboard?

Have you blocked yourself from accessing your Website?
Have you found your requests/IP address/country/ASN number/User-agent at Firewall events at Cloudflare dashboard?

Is the 1020 error for your Website or someone else’s?
Maybe someone else is using Firewall rules to block specific things like users from specific countries, etc.