Static routes doesn't work

Hi.
I need a static routes from my LAN 192.168.8.0/24 to the lan IP of my opnsense firewall running on 192.168.100.0/24 using dedicated ethernet on proxmox host without vlan tag.

If I set static route to 192.168.100.0 for 255.255.255.0 to the gateway 192.168.100.1 I can’t reach the firewall LAN IP. Where I’m wrong?

For test, If I add second IP to my PC like 192.168.100.2 I can connect correctly to the second LAN. Also… running zerotier one on opnsense and setting up the routes inside zerotier to opnsense vlans it are working correctly…

I have tried also to reboot the glinet router but the static route doesn’t work.