Struggling with a VLAN setup

Hi all im certain i am missing something really basic but im hoping someone knows and can help

I have an ISP provided ONT. i can remove their shitty arris gateway as long as i can tag the connection from the ONT with VLAN 1000

i am able to use the ui to create a VLAN on that port with the ID 1000 and pull my public IP properly. however when i do this all devices connected through the ER-X lose internet access. i have also tried setting that VLAN ID solely on the switch0 interface and both on SW0 and eth0 none of those seem to work either

am i missing a static route?

i have no idea why this doesnt work and i would much rather remove the crappy ARRIS hw

i will happily answer any questions about my setup