Also Molester Man (Chikan Otoko) is also a pretty good slice of life although not as good as Onani Master. Don't be put off by the title lol it's not that perverted.
Negative Happy Chainsaw Edge. Same author as NHK. Trippy slice of life that uses metaphors to present psychological themes. It's your type of series I believe.
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https://myanimelist.net/manga/21525/Akatsuki_no_Yona
And you could check also my plan to read list.
https://myanimelist.net/mangalist/Tonia_Az?status=6
Yoy may find sth that will capture your interest.