Can’t login anymore | WordPress.org

Hello all,
I updated my site to 5.5, but I couldnot login in my admin anymore.
So I reverted back to 5.4, but the problem still is there.
I can’t login to the admin. It says: “No Update Required
Your WordPress database is already up to date!”
And if I continue it goes to the main page of my site.
What should I do?

https://www.libralion.com/blog/

The page I need help with: [log in to see the link]



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