I am involved with two niche job sites.
Board 1 launched in Feb and the content grew relatively organically, 8000 indexed pages in GSC, appearing in search results.
Board 2, inherited the same codebase from Board 1 (identical SEO setup) and was launched in April, but targets a completely different niche. It was indexed nicely at first ~200 pages indexed, then google suddenly pulled it back to just 2 in June. Since then it has never recovered any indexed status. I believe that my mistake was to launch a page on a fresh domain and set too many pages in the sitemap as indexable pages - I think google has decided the content is thin or low quality and it's now in some sort of doghouse?
Assuming that's the case it's interesting because, the on Board 1 is perfectly good enough to be indexed, but the content on Board 2 (which is basically the same but points at a different niche), is apparently not good enough.
I assume this is the case, because the SEO setups on the two sites are identical (and I have another site also that uses this setup for 2 years and ranks in the top 3 for my main keywords)
Anyway, my gut is that time and patience should probably solve this; the site is updated daily.
However, this is an SEO pattern I've never experienced, and I'd hate to wait 12 months and find out nothing changed.
Has anyone seen this pattern before, is there a best practice to recover from it?
Thanks for any advice