You’re using LXC… so you may want to learn about Incus/LXD that was made by the same people who made LXC, can work as a full replacement for Proxmox in most scenarios. Here a few reasons:
It is bellow the Linux Containers project, open-source;
Available on Debian 12’s repositories;
Unlike Proxmox, it won’t withhold important fixes on the subscription (payed) repositories;
Is way, way lighter;
LXC was hacked into Proxmox, they simply removed OpenVZ from their product and added LXC and it won’t even be as compatible and smooth as Incus;