My first post here got deleted cause of the 30 unapproved status
why is it like that?
is there a way to keep 'em on the site?

this is the post-> https://e621.net/posts/3331686

its kinda sad since its my first post on this site

also can my other art get approved too ?

There's a sticky thread already for this topic #23578

tl;dr of that thread/the question you want answered

Q: My post has been deleted by the Auto-Moderator?
The Auto-Moderator purges the leftovers and gray areas that other staff don't want to either approve or delete. The images itself likely has been seen by more than one member of staff, but hasn't been deemed either good enough to pass, or as bad enough to require deletion.

Q: I believe the deletion was unfair, can I reupload the post again?
A: No. If you believe the deletion was unfair please contest the deletion by writing a dmail to the member of staff who deleted it.
If you're caught uploading the same image twice we will take disciplinary actions against your account. This can and will lead to a permanent suspension of your account if required.

Q: I want to contest the deletion.
A: Write the person who deleted the submission a dmail and you can ask them to reconsider the deletion if you believe it has been deleted in error.

Please note that insulting or harassing staff about deletions can and will end with disciplinary actions against your account.
If you ask them respectfully they are also more inclined to give you a respectful answer.

Since this is an auto deletion, dmail any member of the staff i'd say.

zetsuyoshi said:
My first post here got deleted cause of the 30 unapproved status
why is it like that?

Some submissions aren't bad enough to delete on sight, but not quite good enough to be easily approved. The thirty-day queue is there to ensure that pending submissions don't sit around forever hanging in limbo if approvers can't quite make up their minds.

is there a way to keep 'em on the site?

Keep working on your art and improving your skills.

There's a reason they say "Don't upload your own art here". This is an archive, not a gallery; the rules are different than you're used to elsewhere.