Ahah, I’m even surprised that this console is still alive and that you have it in your hands :)
I don’t want to upset you, but the chance that you can fix it is very low. Because there is pretty old technology and even the master could not fix the screen, so you have two solutions. You can spend a lot of money and buy limited consoles or install an emulator with various games from [https://romsie.com/roms/gameboy-advance|https://romsie.com/roms/gameboy-advance] . It seems to me that the second option is much more reasonable. I tried this method and it works great!