Does anyone know a reliable platform that offer service for manga drawing? I want to take job for drawing manga as freelance

You can list your freelance service in websites like fiverr or even deviant art. Like for me being involved in game dev I look for game artist in game dev related forums like opengameart.org (2D sprite artist and random stuff) or lemmasoft.renai.us (Visual Novel, character, background, etc artist).

By the way, you got portfolio can PM me?

Tried fiverr and deviantart long time ago but it really hard to get noticed. Currently, I only work as assistant related to manga drawing as base coloring, would like to explore more experience and also get paid of cuz

You can check the artwork I did over here though
https://www.instagram.com/hasegawawong0614/

Yeah, like they say here "rezeki jangan ditolak" I'm also struggling to earn a living as well.

Awesome art profile, we have similar art style it seems. I should start my own art profile as well instead of posting up a spoiler here.

As long it is a paid work, I always do my best to complete it, I work like 11am to 10am a day if I got job coming in, instagram is a good platform to post art portfolio I guess