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Discovered not indexed means there were no technical issues.
Discovered/Crawled not indexed is purely a Google Authority Issue.
Once you start piping authority to these pages from other pages (which must have regular organic traffic), Google will index them.
As you are a job aggregator site – my advice is to build more perma-ank URLs that dont get deleted as much and build internal/external links to these.
The more links you have on these pages, the less authority that is shared a they divide them amongst themselves
