Something that I have noticed when creating projects is that I tend to lack in the creativity department. I always do a good amount of research and make pictureboards with different references for what I am trying to create in my projects, but when it comes to actually creating something based off of my findings or coming up with a design by myself, I am not very good at expanding my creativity. I will say that I am not completely incapable of coming up with simple, basic assets to use in my projects, but I lack the ability to take my assets and environments to the next level. If anyone has any strategies or advice that they would be willing to share, it would really be a big help!  

Keep practicing creativity, it's a muscle. "Luck" also plays a big role. Sometimes you are on a streak of luck, sometimes you create 20 crappy pieces of art in a row. But usually it's somethting in between. All your failures are important because you end up not repeating them. Keep at it and here and there you get rewarded with a cool piece you are proud of.

I got into 3d graphics because of my limitations in creating art. This software lets you create an image using 3d assets, and then render it (makes it 2D) which I then use in my games. The assets look professional, and doesn't require me to draw them. 

The other thing that helped me was participating in these art sites, because in trying to keep up with what others were doing, I learnt many features of the graphics software I was using, that I wouldn't have otherwise. (And didn't realise it at the time - I was just playing around with it). 

For example, at Renderosity, you can post an image and ask for feedback. These 3D sites are not as popular now as they were 10 years ago - so it might be more difficult to get feedback, but it's what worked for me.