Oh no worries about that- I would be the last person to criticize somebody taking a break from alien designs. I, myself, am focused primarily on human OCs, and aliens were always more of a side consideration. I also tend to get fangirly and preoccupied with other stuff too (there was one summer a few years ago where I was wholly obsessed with Yu-Gi-Oh, and before that, Digimon, and other various shows and fandoms over the years where I was making fan characters and unable to bring my mind around to my own original story-worlds) so I completely understand.
Even though I am not a fan of Steven Universe, I've liked the designs you've been making for your fan characters there, and again my main love is OC's more than speculative creature design anyways, so no obligation for you to bother with original aliens unless you feel so inspired.