Switching between nvim configs can be really easy to do since they implemented the NVIM_APPNAME Environment Variable.
NVIM_APPNAME=nvim-lazyvim nvim
Now config will be loaded from ~/.config/nvim-lazyvim
Michael lays out some aliases in the full article.
alias v='nvim' # default Neovim config
alias vz='NVIM_APPNAME=nvim-lazyvim nvim' # LazyVim
alias vc='NVIM_APPNAME=nvim-nvchad nvim' # NvChad
alias vk='NVIM_APPNAME=nvim-kickstart nvim' # Kickstart
alias va='NVIM_APPNAME=nvim-astrovim nvim' # AstroVim
alias vl='NVIM_APPNAME=nvim-lunarvim nvim' # LunarVim
