Reblogging is not just important to show creators support- we as a community will literally not be able to find new content unless it circulates or ends up at a visible place in the tags. That means that what shows up at the top of the tags and in recommendations all comes down to the number of reblogs. I mean that tumblr has an algorithm, the same as YouTube or tiktok, and the algorithm only registers reblogs. Okay since this is in my notifs again: I don’t mean only reblogs show up as notes (the little number in the bottom corner of posts). Reblogging is vital to keeping this community alive, otherwise we stagnate what ends up happening is a lot of really great fic gets buried because it was posted, like, a day ago, so it doesn’t show up in “recent” and it doesn’t show up in “top” because of lack of interaction.
I don’t know how everyone finds fic on tumblr, but i tend to go through the tags. that means if something gets 100 likes and 5 reblogs, that thing actually registers as having 5 notes. So you may or may not know this, but the tumblr metrics system works in a really interesting way where it literally does not count likes.