Hi, use the mirror sites of julia registry may help.
Try
export JULIAUP_SERVER=https://mirror.nju.edu.cn/julia-releases/ # Linux & macOS
export JULIA_PKG_SERVER=https://mirrors.nju.edu.cn/julia
Write them into your .zshrc if you want it be set everytime you login.
Also, if you are using a WSL, then the proxy may fail due to internet connection settings for WSL. I’m non-expert in this question, but if you really ran into one, I can provide some hacky solution…