HTTP 500 error can seem to work it out

hi I set up my VPS with ovh 100% fine and moved a lot off my websites from an old USA company to the UK datacenter as a lot of the sites are for UK customers so why we made a move to ovh

but one website seems to get an HTTP 500 error, and i can't work out why all the other sites seem to work fine I also tried removing the .htaccess file with no like any ideas why it was making this happen sometimes i get a white screen and not an HTTP 500 error the site is running wordpress

if anyone could help this would be great