can anyone recommend me any of the author's other stories? they have so many I don't know ...

Every her stories is good imo, if you have time you should check it out but Saezuru by far is her masterpiece, i think (≧∀≦)

Doushitemo Furetakunai, soredemo is my recommendation for this author but its not Yakuza related tho, more slice of life, office vibe.

thanks!

if you want one of her work that's related to Yakuza then you have
Nights ( pretty good too )
if you want like every day life or something like that then my recommendation
Kanjou Spectrum
http://www.mangago.zone/read-manga/kanjou_spectrum_yoneda_kou/
Doushitemo Furetakunai
http://www.mangago.zone/read-manga/doushitemo_furetakunai/

but honestly , all her works are good to read even those that still not finished
( hope one day we will be able to see the continuation of all those stories )

thank you!!