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As mentioned on the block page, you will need to reach out to the site owner. You are blocked because of something the site owner configured, and Cloudflare can't help you get unblocked.
If the site owners believe it's a Cloudflare problem or that our help is needed then they need to contact support. Individual users reaching out does not accomplish anything as all assistance we could provide has to be directed at the site owner.
If you are somehow completely unable to run a proper certificate on the origin (EC2 instance(?)), and thereby Full (Strict), my suggestion would be to switch the set up to run over a Cloudflare Tunnel instead.
Even then, if seeing the origin IP of yours leads to a security issue of some sort, I would go as far as to say you have other and more serious problems that you should solve first.