I am unable to login as admin in my web site

I have installed wordpress on my domain.
I faced DDos attack on my website after that i switched to cloudflare and do some change.

But now I am unable to work as admin because when I try to login using domain_name / wp-admin after successful login it send me to domain home page in place of domain_name / wp-admin.

What do I do. If I am locked

Welcome to the Cloudflare Community. :logodrop:

Have you paused Cloudflare yet to determine if it is involved?