Site down after putting domain in cloudflare. How to resolve?

I put my domain correctly in Cloudflare, the panel says it is active but when I do a speed test it returns an error, site down. Does anyone know what can it be?

what is the domain, example dot com

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It’s not offline anymore, but it has a big oscillation in performance according to the pagespeed, is this normal? This is my domain marcusoliveiradev.com.br