We don't really do anything to support Vulkan other than enable it. Unity does what it does. The only way we improve our Vulkan support, is update Unity, which we only do when we feel a Unity version is at a stable point for us to upgrade and then lock into some bug fix version of that before we release. I've been looking at our next Unity update, with their next LTS probably in 3-4 months, but I can try 2021.2 sooner as the next LTS is just a version of it with bugs fixed.