Unable to update plugins and change setting

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Hello, I haven’t logged into the site and updated plugins in a while. When I tried to do this a few days ago, in place of the Update Plugin button, I got the following message:

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> 403 Forbidden Forbidden

Also, when I try to access settings or any page in WordPress Dashboard, I get a white page with the following message:

Forbidden You don’t have permission to access this resource.

I checked and it’s been a month now when I haven’t received any WordPress notifications or any emails when I tried to reset my password

I have access to the website also by FTP but I don’t know what should I do. What seems to be the problem?

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

 

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