I can relate to this... Once, i published a new series for a webtoon contest, the update has 60+ panels and i worked for days for it, i felt really nervous when publishing it, only to get down-rated to a 4 or something within minutes... after that, no one bothered to check it for a while because of the horrible rating, i checked other comics that was updating at similar time as mine, because i thought i was just updating at a bad time when trolls are roaming around down-rating comics but no one experienced the same thing as me, thought that someone might hate me or something... In general, ratings are very biased, especially during contests.
I know that it hurts especially knowing how hard you worked hard on it,so i hope you won't get discouraged too much, and good luck, you have nice drawings