URL Indexed But Not Submitted to Sitemap
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If you Care about the Search Console Error ONLY
It just means Google has decided to index some URLs which do not appear in here: http://www.servicesarab.com/sitemap_index.xml
so add them or don't, it really doesn't matter that much and it is extremely unlikely to change your SEO performance much at all
If you are Really Concerned about SEO Performance
personally I think that this is quite telling:
https://analytics.moz.com/pro/link-explorer/spam-score?site=servicesarab.com&target=domain
According to Moz, 45% of the domains in their index which share similar features to yours, have apparently been banned or penalised by Google (not really good)
You site has (according to Ahrefs):
https://ahrefs.com/site-explorer/overview/v2/subdomains/recent?target=servicesarab.com
18,840 backlinks from 242 referring domains. That's a pretty crazy balance, not very diverse at all
https://d.pr/i/0ROVCA.png (screenshot)
It seems like end of 2017 / beginning of 2018, tons of links for the site were produced in a very artificial and obvious way
In the end, old SEO tactics that try and trick Google into thinking your site is great, are not very useful in 2018/2019
It's doubtful that there is a strong technical-SEO reason for the site's problems. It is more likely that Google is just restoring your site to 'where it should be' in the rankings
It seems as if the usage of older SEO techniques tricked Google for a little while:
https://d.pr/i/tsiXrh.png - but in the end, the unsustainable approach was not good enough