I took a look at what you've already been reading (to rule out recommendations). Give 'Happy together' a try if you haven't yet! No smut so far and it is very plot driven.
Another good one is 'Global examination', it has a novel and I'd definitely recommend reading the novel first.
Both of these are ongoing btw.
https://www.mangago.me/read-manga/paljae/
I've read 134 chapters in two days, it is one of the best stories I've read since I start reading manwhas. It has a really solid plot
The story is placed in ancient Korea with all its myths and legends, so there are gods, demons, magic, etc. The mc is a blind sage, he lives secluded and per chance he helps a creature, this will take a human child form. They live together and roam through different places solving cases/missions while at the same time lots of info from their past is unfolded. I don't want to spoil you with many details, but it is really good give it a try!
there's not much sex in hate mate & it's all drama driven and about the story progression (& is one of the more unique bl dramas imo). Love history caused by willful negligence is a great psychological romance & the first part has literally zero sex and basically no romance, it's pure plot & establishing the feels. They fuck a lot in the second half, but it serves plot purpose & never felt like we were getting a sex scene just bc.
https://www.mangago.me/read-manga/love_history_caused_by_willful_negligence/
https://www.mangago.me/read-manga/hate_mate/

I’m so tired of the overly sexual BLs. Pls give me smt to read that has a plot and not to much smut. Give me smt underrated