Website down after changing nameservers to Cloudflare

Hi, I need help, please.
I have recently changed a hosting provider to Siteground, with the previous host provider I was using the Cloudflare. After this change, I changed the nameservers back to Cloudflare and my website went down immediately. I really don’t know what to do. Everything went wrong from the day of the change, my site went critically slow first. Then when I changed to Cloudflare it went down. I am not a big techie and learning everything from the scratch but I’m worried I have done something really wrong. I will appreciate the help. Thank you

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