Is one GSC sitemap submission enough?

I would recommend to focus on the new things to consider according this new vide from Google central about indexing too
, basically you got discovered but not indexed due to the lack of quality in your articles , so then google will plan to index your content as low priority
So “discovered but no indexed” means that your posts is poor? I have tons of this posts not indexed lol
 
Keeping your sitemap accurate and update is enough than frequent resubmission
 
Update your content regularly ,Ensure your robots.txt file allows search engines to crawl your sitemap.
 
One sitemap is enough for a website, no need to worry about it. Based on your website crawl budget the search engines crawl your site.
 
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