I realized I can't plot

I've realized I don't plot correctly. Now I know everyone is different some don't plot, some write everything down. That's not really my issue though. I just realized that I feel like my books are always way too simple, have too many characters or too little, the world is too complex or too boring. I can't come up with plottwists and I can't tell whether they'd be good or not. I've been plotting a book for days now but nothing I come up with makes me happy. The "just start writing" advice doesn't help me either, I've done that countless times and stopped again. Anyone had that problem? And advice on it?