I think many people request a cover from other people, for example i do only covers (cause i find really difficult to write on episode there are lots of coding and so on and I’m just not good at doing it, so i find easier drawing something).
So you can find a free shop here on the forum that is able to help you without paying or you can ask to someone that do commissions (like me) and it’s not free also cause i use an app (procreate) that is not free. While I’m there if you need a commission for a cover i can totally do it for you, here some example of mine:
But if you are not willing to pay there are lots of shops here on the forum that are free and that can make you a very cool cover, or if you want to draw a digital art by yourself i recommend to have a tablet with a pencil and to search for some app, i really recommend to you procreate even though it’s not free, otherwise i think there are other free apps that can help you (i don’t know the names sorry). I think that’s it if you need anything else let me know 