I've read 10 years I loved you the most and some popular angst stuff, I need some other recommendations, it could be bl,gl or even straight.
https://www.mangago.me/home/mangalist/842448/
You can try these~
More plot focused than romance focused.
Not sure what exactly you mean by neogothic, but maybe you'd like this?
https://www.mangago.me/read-manga/drcl_midnight_children/
Yeah he's an incredible mangaka. Maybe try Tanabe Gou's works? He does adaptations of H.P. Lovecrafts books:
https://www.mangago.me/read-manga/h_p_lovecraft_s_the_call_of_cthulhu/
It's not what I'd describe as gothic though. A more fitting manga would be Vampire Hunter D:
https://www.mangago.me/read-manga/vampire_hunter_d/

I've been going through some shit. Maybe reading painful stuff will help me cope. I am tired of breathing anyway.
taming the tiger and the nameless flower
Ten years I loved you the most
The married man
i hope you feel better soon man
December rain. - (Bl, two lost people finding solace in each other amidst a chaotic manhunt. It will make u feel sad and depressed)
This with of mine. - (sl, features different stories of witches experiencing love, pain, and loss)
Hope u feel better soon!
i hope you’ll be okay, if you can, try reading fluffy stories instead of angst ones
but still here’s some recommendations
https://www.mangago.me/read-manga/about_death/
https://www.mangago.me/read-manga/homeless/
https://www.mangago.me/read-manga/then_i_ll_go_first/
Amber alert, BL- there’s self harm in the story
Home far away
Painter behind the curtain
Painter of the night (pls don't hate me)
https://www.mangago.me/read-manga/the_third_decade_dindin/