The Modus Themes, which are included with Emacs, are great. These are high contrast themes adhering to WCAG AAA.
They have been ported to Vim and VSCode, but IDK about JetBrains.
https://protesilaos.com/emacs/modus-themes
https://github.com/ishan9299/modus-theme-vim
https://marketplace.visualstudio.com/items?itemName=Binx.mod...