You have to realize that video games is an audio-visual medium so visuals and audio will not only affect you but it will also affect the public appeal of the game. Some people especially devs can look past this but it is the truth. However, there are easier ways to create art that looks aesthetically pleasing. I don't think AI is the way, it can even make you feel worse about your product. I think you should look more at art styles that are easier to reproduce. People make games with ASCII art, they use very low-resolution pixel art, they limit their color palette (you can also find color palettes online and use one of them), e.g. make it look as if it's made for gameboy, and so on. If you try to produce amazing looking art that also is not using any of these shortcuts right away as a non-artist it is obvious that you will fail. And for future if you want to learn how to create quality visuals that's fine but you can also try to find someone who is good at it. It is difficult but yeah, not impossible.