Do you know any great manga/anime made by actual LGBTQ people? I only know Nabari no Ou.
Yes, Kamatani Yuhki is a godsend. You should check out their other manga, Shimanami Tasogare, if you haven’t already.
Otouto no Otto by Tagame Gengorou
The Boy who Cried Wolf by Mentaiko
Sabishisugite Rezu-Fuzoku Ni Ikimashita Repo by Nagata Kabi
Honey & Honey by Takeuchi Sachiko
There are a lot more, but this is a good starting point, since all of these can be found online in english. Others, like say Kumada Pooh-suke’s “Honjitsu mo Ohitori Homo”, are only available in Japanese.