Is there any chance that you could give me access to the dashboard area so I can have a look at the settings on your website, please? Also, confirm the permission for plugins deactivation, and switching to the parent/default theme. As soon as we complete the testing we will enable all back.
Seems that your server is not stable because on the default theme, we can see that site loads around 3.8s and It’s not normal for the default theme. On the default theme, the page should load around 1s.