Website 500 Error and Plugins Problem

Hi,

I have issues with my Website https://www.gbajumo.com I installed Advanced NewsPaper Theme on it in July and by September, I noticed the Feature Image for each post, category and archive were not showing again on the homepage.

Also, it was always showing 500 Websmaster Error.

I contacted my Host company and they have threatened deleting the Site if I don’t rectify the problem in 2 days. I can’t afford to reset or delete the site as it contains so many posts from Clients on it.

The major problem now is I can’t even access the Wp-Admin section of the site again as the site doesn’t display anything.

I have logged into the CPanel to delete the Theme and all plugins on the site so that the site can be back to Default theme and plugin but nothing seems to work on the site.

Please I need HELP who can assist me on this.

Thank you.