I happened to download Go-Sai Tamanegi's Pixiv account yesterday and today I discovered it's been deleted. Here's the archive of their former account.

Pixiv (deleted): https://www.pixiv.net/users/28184282
Fanbox: https://www.fanbox.cc/@gosaitamanegi
Twitter (alive but rarely posted to): https://twitter.com/5Tamanegi

ady1392 has uploaded an uncensored collection of Go-Sai Tamanegi's art and I highly recommend checking it out here: https://e-hentai.org/g/3049534/18a88e9b3d/

I hope this doesn't mean they're going to stop posting art to Fanbox, because they're a great artist.