Serges

May be the payment for Hosting or domain name of the old account was not made in time and the account was disabled.

You can try to enable debug mode in WP and check more text for this error. Then you can type it here.

Regarding your issue with 520 Cloudflare, probably you need to contact you hosting provider and describe him this issue (with screenshots and browser console screenshots)

As for 500 error, you can try to enable debug mode and check this issue.
I am not sure will it be helpful for you, but you can try to disable all your plugins and then activate them one by one and check the issue. If it doesn’t help, you can try to witch temporarily to standard WordPress theme (as I see, you had some problems with your current theme).

” there is a newer version ” do you talk about WordPress update?
I think, there could be a plugin conflict. Disable all your plugin one by one and check the issue?
Even if it doesn’t help, you will know that this isn’t plugin conflict.
Maybe you can also try to use only English and check the issue?

I agree with previous answer cause there is a possibility of plugin or theme conflict.
Try to disable all your plugins via FTP and them enable them one by one and check the issue.

It will be better if you describe your request more detailed. Maybe you can provide the screenshot of the tags you want to hide?

Can you provide the screenshot of your result (the logo is under another)? Did you try to place your logo in the different places of footer?

Your request is a little hard to understand.
As for me, you need a Contact Form plugin+some kind of Quote dashboard. And in order to accept the quote, user need to be registered?

As for me, it looks like plugin or theme conflict (i think). Try to deactivate all your plugins one by one and check the issue. Thus you will find out which plugin causes the error. If it won’t help, try to switch temporarily to a standard WordPress theme.
In any case, if it doesn’t help, you will know that this issue has nothing to do with the conflict.

I can’t access your site now, ERR_NAME_NOT_RESOLVED.
Probably because it on the local host?
In any case, you can try to deactivate all your plugins one by one and check the issue. Thus you will find out which plugin causes the error. If it won’t help, try to switch temporarily to a standard WordPress theme.

It will be better if you provide more detailed description. where should your instagram display? Do you use any plugin to display it? What did you do before it stopped working (update or install plugins/theme)?
Do you talk about this https://prnt.sc/gr5p83? If yes, the button is working now.

Can you provide some examples of it?
In the lightbox you want the clicked image to be bigger and the other images from post to be as clickable thumbnails?

Can you issue be reproduced from the front-end? I checked your site and different pages, but I can’t see the 404 errors and pages work fine. Or you see it only in the Google Webmasters?

Can you clarify, you want to post the information, which you got from users, on the map? Like make a marker with their address and insert the information to marker description?
“their physical location” will users manually write their place or you want to have GetCurrentPosition function?

“got the update” what do you mean by that? Update of your plugins or WordPress?
Do you have see any errors? Or maybe you have some errors in the console when you click “Edit” (post, for example)?