https://matchamelon.fanbox.cc/
https://www.pixiv.net/users/25870793

The last post from Matcha Melon was on his Twitter account, back in February 2022. However, at the start of 2023, he deleted all his tweets and his Twitter handle changed from @matcha_melon to @_Melosy. Then, on March 18, the artist linked this account with his main one: @melon__syrup. So apparently, Melon Syrup and Matcha Melon were one and the same all this time. Listed below his other social media:

https://melonsyrup.fanbox.cc/
https://www.pixiv.net/users/27845785
https://twitter.com/melon_syrup
https://twitter.com/melon__syrup
https://twitter.com/_Melosy

His FANBOX account is still up, although new content hasn't been uploaded since February 2022. All his Pixiv artworks can also be found here: /g/2288907/4987adb42d/.

This gallery includes all posts from his FANBOX, plus two deleted images from Twitter.

From newest to oldest.
1 - 2: Twitter
3 - 259: FANBOX