Update your story line write something that reflect what you do
upload more gigs
use attractive eye catching gig image. you can follow this guidelines https://www.fiverr.com/support/articles/4410883326481
and wait don't be impatient
you can't send buyer request through fiverr mobile app.
Follow this to know more https://community.fiverr.com/forums/topic/284572-fiverr-is-updating-buyer-requests/
you have to complete and submit orders on time.
if you need more time you can ask your client.
regarding Fiverr order submit notification
I think this notification send for 1st order as the time is lass then 12 hours