Reach out to other websites in your industry and ask if they would be interested in linking to your content. Monitor your backlinks regularly to see who is linking to you...

Check sitemap's path by opening it in browser once.

I submitted it in the GSC section and then submitted it. It shows me the following error. Sitemap could not be read > General HTTP error > We encountered an error w...

Anywhere, from where you can open that XML file in a browser. Yes, at the search console sitemap section.

@binayjha Where to submit subdomain sitemap's on main domain? At search console sitemap section or somewhere else?

Put the subdomain website's sitemap on the main domain and then submit. More information is here, https://developers.google.com/search/docs/crawling-indexing/sitemaps/bui...

Why it doesn't work? What's the error message? Did you trying submitting under xyz.abc.com property? Seems like you should submit it there if you have created it already.

No. No need for a VPN in this case. A business location and service area can have different locations. Search engines understand this well.

See the post above^, it doesn't make sense...

Google Search Console Broken Link Checkers (Online Tools) Browser Extensions (e.g., Check My Links) Crawling Software (e.g., Screaming Frog SEO Spider) Backlink Analysis...