Jorge Luiz

Firstly, desactive all plugins you’ve installed. Then, check out whether the issue still occurs.

Do all locally.

Did you already try to delete all plugins, and to set the theme to default?

Delete all any other themes too.

Observation: copy all backup to your PC too for safety.

• This reply was modified 2 years, 2 months ago by Jorge Luiz.
• This reply was modified 2 years, 2 months ago by Jorge Luiz.
• This reply was modified 2 years, 2 months ago by Jorge Luiz. Reason: Improved my answer
• This reply was modified 2 years, 2 months ago by Jorge Luiz.

What the exact plugins and theme are you using for trying to manage your issue?

At some moment did you change the .htaccess file? It’s the same since the live WP installation, I meant is it default as it was?

Did you already remove all plugins, and after that check your WP installation out?

References:

WordPress Error: WP-Admin Redirects to a 404 Page

• This reply was modified 2 years, 2 months ago by Jorge Luiz.
• This reply was modified 2 years, 2 months ago by Jorge Luiz. Reason: Improved my answer

Make an WP installation locally in your PC, then begin to try to solve your issue after restoring your backup to that local WP.

What theme are you using?

Try to get up and running a WP installation local, and just install that theme. Then, check out whether the same issue occurs.

Look at those articles bellow for knowing how to backup via CPanel:

• https://noracheikh.com/wordpress-ftp-backup/
• https://www.makeuseof.com/how-to-backup-your-wordpress-website-manually-with-ftp-or-using-plugins/

Does your hosting plan offer ftp access?

Because if so, you could backup your installation by ftp.

Whether theme doesn’t support navigation menus or widgets. There’s no much what to do.

So, in my point of view there’re only one unique alternative for you, to try to use another theme which supports the features you need.

That’s my 2 cents.

• This reply was modified 2 years, 2 months ago by Jorge Luiz.
• This reply was modified 2 years, 2 months ago by Jorge Luiz.

You must look for following CSS class .header-wrapin the CSS files in your theme and add the following code:

text-align: left;

• This reply was modified 2 years, 2 months ago by Jorge Luiz.

Maybe this post could help you with your issue:

You need to access the phpMyAdmin app, usually through your hosting account. Locate your site’s options table. Search for the option_name “blog_public”. Click the edit link in the found row and change the “option_value” from 0 to 1, then click “Go”.

Is your WP, themes, and plugins version latest?

If not, try the following steps:

• Firstly, do a full backup;
• Desactive all your plugins;
• Update all your plugins;
• Update all your themes;
• Upgrade your WP installation;
• Check out whether your WP installation’s working without any errors;
• If so, active the plugins;
• Check out whether your WP installation’s working without any errors again.

• This reply was modified 2 years, 2 months ago by Jorge Luiz.
• This reply was modified 2 years, 2 months ago by Jorge Luiz.

• Firstly, do a full backup;
• Update all your plugins;
• Upgrade your WP installion;
• Check out whether the issue’s solved.

• This reply was modified 2 years, 2 months ago by Jorge Luiz.

I’m not sure.

Sorry, but now I realized that your installation’s a wordpress.com’s service. What’s a totally different service.

The better and right place for you to ask some support about your issue is directly in link bellow:

https://wordpress.com/support/contact/

This is their official support page.

Please, add the critical error to your post for can help you out with your issue.

You must to change a css selector called ::selection in your CSS file of your theme.

For more detail look at the links bellow:

• https://www.fwait.com/how-to-change-selected-text-background-color-in-css/
• https://www.w3schools.com/howto/howto_css_text_selection.asp