Finding inspiration is hard for many people out there. I don’t know how many times I get stuck with an initial concept but never take the project any further because it just didn’t seem right or did not spark joy. In these cases, you don’t have to give up. You can easily find something on the internet that will spark your imagination. I am not saying that you show search the web for people designs to copy and paste as your own, but find the great things in art and use that to create your own. Look at things like the colors, the anatomy if there is a person in the image or the special effect in a video. Anything that jumps out at you. A quick google search will get you to where you need to be but if you don’t have luck with that you can try some of the links below.
Also, don’t forget about Pinterest and Instagram they have loads of inspiration from all sorts of different places. Deviantart is also a great place where people place there actual designs that they created. I also recommend checking some of those out as well.