Any recommendations about topics deep on suicide or numbness

Can I recommend some good to improve mood?

Sure!

Brutal: Satsujin Kansatsukan no Kokuhaku
https://www.mangago.zone/read-manga/brutal_satsujin_kansatsukan_no_kokuhaku/

Once upon a time
https://www.mangago.zone/read-manga/once_upon_a_time/

The World’S Best Engineer
https://www.mangago.zone/read-manga/the_world_s_best_engineer/

Living as the Tyrant's Older Sister
https://www.mangago.zone/read-manga/living_as_the_tyrant_s_older_sister/

Eleceed
https://www.mangago.zone/read-manga/eleceed/

Shadowless Night
https://www.mangago.zone/read-manga/shadowless_night/

These are good

For sad type :

Koukai no Nai Jinsei wo
https://www.mangago.zone/read-manga/koukai_no_nai_jinsei_wo/

Love Letter (Ozaki Kaori)
https://www.mangago.zone/read-manga/love_letter_ozaki_kaori/

Sleeping Dead
https://www.mangago.zone/read-manga/sleeping_dead/

1866
https://www.mangago.zone/read-manga/1866/
Sadistic Beauty BL Sidestory
https://www.mangago.zone/read-manga/sadistic_beauty_bl_sidestory/

The Mermaid and...
https://www.mangago.zone/read-manga/the_mermaid_and/

Not Simple
https://www.mangago.zone/read-manga/not_simple/

10 years where I loved you the most
https://www.mangago.zone/read-manga/10_years_where_i_loved_you_the_most/

Fairy Gone Garden
https://www.mangago.zone/read-manga/fairy_gone_garden/

These are kinda different

Read a few but the moment I saw 10 years that I loved you, 1866 and the world's best engineer I knew the rest are gonna be great!
Thanks!!