Hi, Gameplay will always be more important than graphics. But if you want to create good graphics then clearing the concepts of PBR (physically based rendering) will help a lot. It will save you a lot of time which might be wasted on doing trial n errors. For starters you can take textures and models from https://texturehaven.com/ , https://hdrihaven.com/ and https://3dmodelhaven.com/. Later you can easily created PBR textures in blender. Blender is free but it will require some practise.
Thanks mate, I've used blender for about a half year and that was what initially got me to make games, most of my assets are created by self in blender and due to it, I have faced issues with textures on them, PBR texturing was something I started learning but didn't go very far with it, I do realize that beautiful world with millions of gameplay issues will not be as good as a modest looking banger of a game and will look forward to games that support the idea. As for the concepts of PBR, I'll pursue learning it further, the sites you've recommended may just help me in making my worlds look a lot better.
Thanks for everything.