Just change your IPs in your /etc/network/interfaces,
then
/usr/local/vesta/bin/v-update-sys-ip
or goto WebUI >> IP >> Re-Read IP
then do
/usr/local/vesta/bin/v-change-web-domain-ip
for your domains one by one or batch them
After that just rebuild Web/DNS/Email for your users and reboot your server.
