Wordpress expert

We are having issues with our wordpress.
The problem: Every time we upload an image to add to a post the site shows an error message. The error message is - 504 Gateway Timeout error occurred.

According to our host Site Ground -
the issue with your WordPress website https://www.asianstandard.co.uk/ by deleting the php_errorlog file in the public_html folder. The log file was very big and your cloud server was using a lot of resources just to open the file. This why the 504 Gateway Timeout error occurred.

The log file was filled with messages like these one:
[26-Jul-2023 12:03:02 UTC] WordPress database error Table 'db9fs3ngs6ufhy.wpmv_Counterize_Countries' doesn't exist for query UPDATE `wpmv_Counterize_Countries` SET `count` = `count` + 1 WHERE `countryID` = 0 ; made by require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/plugins/td-standard-pack/Newspaper/page.php'), get_header, locate_template, load_template, require_once('/themes/Newspaper/header.php'), do_action('tdc_header'), WP_Hook->do_action, WP_Hook->apply_filters, {closure}, require_once('/plugins/td-standard-pack/Newspaper/header.php'), wp_head, do_action('wp_head'), WP_Hook->do_action, WP_Hook->apply_filters, counterize_add_callback, counterize_AddCountryVisit


I have to say that these messages continue to flood the PHP error log. The new PHP error log file is getting bigger and bigger. It seems that there is an issue with the SQL table wpmv_Counterize_Countries of your WordPress database. This SQL table is used only by the Counterize plugin. I do recommend that you re install this plugin. If the issue is still present, try to contact the plugin's developers regarding this error.

We have since deleted the counterize plugin (as we don't use it) but the time out error is still happening.

I need someone to look into this to resolve. Also I want someone to manage our site and seo for a fixed monthly fee. So this is long term wordpress site maintenance and seo.

This proposal is only costed for the Gateway error issue, once this is resolved we can look at future work if done well.