As for the error when deactivating the WooCommerce plugin, I was able to reproduce it on my end as well.
This issue appears to be associated with the theme of your website, as I made the following tests:
1. Created a backup of the database and moved it outside of public_html.
2. Stopped the WooCommerce plugin and the error occurred
3. Switched the theme to TwentyTwenty and the website was live again
4. Imported the database from the backup I created to reverse the changes made.