Hello there, welcome to the forum.
I would recommend dedicating to writing if there are no means to pay an artist or to compensate properly for their services, remember that in most manhua the visuals are the first thing to attract readers (And mind you, a reader is not a client), a good quality and consistency of images, creating promotional content, concept art, backgrounds, effects and more will mostly be the heavy lifting of the artist.
The only way to prove to your parents your hobby is not a hobby is by making an income, I would suggest writing original content on Tapas, keep a consistent schedule publishing a novel, and offsite, in places like Tumblr or Archive of our Own to write fanfiction. At the same time try to apply for writing contests, enter classes or courses that allow you to build a portfolio/curriculum so you can later get gigs or offer writing commissions to start generating an income, or even try to apply to paid writing positions.
I must tell you that even if you get an artist to collaborate with you, there is no guarantee that you would see any kind of money, maybe a $1 donation from time to time if you have a Ko-Fi or Patreon, most that make an income out of this have spent several years building their fanbase first, so... don't expect immediate fame nor money, and if you're doing this to gain your parent's approval... sadly, as someone who has been in your place, even if you were to make a living out of it, they'll still want you to get something more stable, or that "What are you going to do the day your hobby doesn't work anymore?"
So try to focus on studies, be it university, tertiary education, a career or job that guarantees you a stable income, make writing or drawing your 4th option.
If you still want to try collaborating with someone, I believe you could enhance your post by using this other thread as a guide and these common questions most applicants have that you could pre-answer to have a more polished pitch.
Before submitting your collaboration request
And better late than never, this Topic goes on the #collaborations category, instead of Questions.