Day Mode/Light Mode is now impossible for me to use

Currently in High Sierra because I borked my GTX 680 and don’t have a great video card for use in Mojave and EGAD. I’m pretty much dark mode/night mode all the time, and now having to go back to High Sierra without a night mode is egregiously obnoxious. How did I ever do this, especially at night/in the evening. I’d better get my GTX 680 fixed or accept the costly mistake of having bricked this first one and buy another because I just… No. Can’t do this.