If you are willing to venture into fanfiction, there are some tags on archiveofourown.org - like "humans are space orcs", " earth is a deathworld", "earth is space australia" - for fics that feature overpowered humans relative to the aliens. Most of these are so AU that you don't need any knowledge of the ostensible source material. The trope seems popular particularly with My Hero Academia and Minecraft youtuber fandoms, for whatever reason.

Generally, the scifi worldbuilding is usually really light, including names "made alien" by adding apostrophes and that kind of thing - but they scratch and itch that almost nothing else does. And they're free! So maybe worth a try at least. Just make sure to filter by kudos.