I guess that "curator" nieche is mostly filled with streamers, like the ones on youtube.
But you do can find some users with public collections here https://itch.io/feed?filter=collections and on the left side of many browse pages, where it reads Related collections. I would pick some after selecting some tags, so the collections are more likely to suit your tastes.
Initially I also thought that the existing system looks like there should be such curators. People that do not publish games, but manage collections and have followers because of that. If there are, I do not notice them much. Maybe the problem is, that you cannot really interact with each other much. There is no private/direct messages and no place to comment on a collection or whatever. On a youtube video you can comment.
Also, there is the hand picked list on the front page, https://itch.io/games/new-and-popular/featured
(Oh, and theoretically there are some sections in the message board for this, but there is not much traffic and if there were, it would get abused a lot by self promotion. https://itch.io/board/13293/recommend-a-game)