Please comment, upvote and share to show support for being able to set avatars on a per-server basis.
A lot of users want this feature and the previous post has reached maximum responses. Upvote the original post here: https://support.discord.com/hc/en-us/community/posts/360029341852-Avatars-by-server
If the devs would respond with why this is not a feature that would be helpful instead of just ignoring the feature request. Clearly if you put it behind Nitro users would pay for it.