As far as I see you want to configure Gvim and i3wm simultaneously.
First open several terminal by Super+Return. Borders should change as it is in ~/.config/i3/config
after pressing Super+Shift+R.
In phase 2 ~/.wimrc should be checked and built up from a simple default one
https://www.freecodecamp.org/news/vimrc-configuration-guide-customize-your-vim-editor/
I would use meld to compare your imported config to a default one. Make copies of the phases that are OK. Progress step by step. Sorry to write such clichés.