I've made more than one list for others (
like this one and
this other), but definitely not Citrus (good try there, that's even more known than Sasakoi).
Hachi7 normally does series that are not much popular and lean on the comedy/slice of life side and
Knight Heron also does works that are not extremely popular, from them it could be
this wholesome family,
Because You Dazzled Me,
Futari Escape, several one-shots (check the
group feed, some works are only on Dynasty),
Pocha Climb!, etc. In the
first link I mentioned a lot of anthologies that you can find typing the key words, normally they are less read compared to series. I am more or less choosing among the less popular but solid recommendations from MangaDex,
Itou Hachi has works that became more popular and others that besides when they were uploaded received few visits for instance,
Amazaki Suika has been active for a while but it's not much popular. The group Danke fürs lesen in the past did quite a handful of funny yuri one-shots like
Strictly Professional Yuri and even /u/scanlations, Noca Scans, Yuri-ism, Yuri Project, Yuri Ichigo and Aoi Ichigo groups have lesser known series, for instance
this one from Mira which is the NSFW old version of the actual Yuri S&M. Some one-shots I have bookmarked are
Always Yuri in Moderation,
We Graduated from being Sisters to Girlfriends,
Shouting at the top...,
Prism,
Yuri Terrorism,
Yuri Otaku Family, etc. As you can see, even nowadays popular authors have lesser known works, my recommendation is checking your favourite authors works and you'll discover a ton without long researches.