Lemme make a rant/explanation.
Do you already have a story, or have you only decided on the genre? If I were you, I would have uploaded storyboards/written plan for the story here. A manga artist won't join you if they don't know what they are getting into.
Do you have experience in writing stories (whether it be novelish stories or manga) or not? Simply saying that you do have a story can be a put-off for manga artists, as they could easily just find another post that had an actual story.
You'd have a higher chance of getting a reliable, heck, any manga artist to join you if they were being paid.
You should add more details in when requesting something/someone. It's like applying for a job in one of the most tricky businesses without a resume.
I'll add you as a friend so I can see your progress, I'd love to see a romance/action/yandere manga get popular, all starting from this thread.
Good luck getting far into the challenging industry that is manga.
(NOTE: ARE YOU GOING TO GIVE IT TO A PUBLISHER OR SUBMIT IT ONLINE I DONT KNOW WHY BUT I WANT TO KNOW)