You need to educate yourself a little on the platform's rules! Downvotes are free; anyone can vote for you whenever they want! There are guides that teach you how to post in a way that prevents you from receiving downvotes! There's the user who voted for you, "possibly" I "think" because you're spamming, uploading photos and photos, without text, low-quality content! A "personal" recommendation: don't do that; make a really good post, possibly once a day, that's what I think!