Repair WordPress+Elementor

Hello, in the page https://www.wsetransport.com I am having a load of issues that includes that plugins in admin area take me to an "critical error page", Elementor data upgrader gives an error, and in front end I can't send email messages.

Is possible a CSS or PHP corruption issue regarding the Theme, probably old code stuck or something I just can't imagine.

I am attatching a text file with some of the errors I am finding and systeminfo from Elementor.

Thanks,