Ipv6 properly configuration

Plan is to have v6 only in LAN.

I have configured openwrt with GUA and only link local, and i have a homelab.
permanent prefix assigned is /56
homelab = , 2001:9b1:cdc0:a300::something.

Now i dont know how to reach it with v6.
with temporary address /128 = cant reach
with normal address /128 = cant reach
with /64 assigned to server = cant reach

right now i have no firewalls rules.

any help would be good.