Secret Indexer sends your URL to over 15,000 sites

Starting July 1, all new sites will be indexed using Google’s mobile-first indexing
https://searchengineland.com/july-1-new-sites-will-be-indexed-using-googles-mobile-first-indexing-317490

Rapid indexer sends your URLs to over 15,000 sites which gives you that many one way backlinks and Rapidly gets your URLs indexed by Google!

Each URL entered will be submitted to 15687 sites to help it get Indexed Rapidly..In total, there will be (1 URLs X 15687 sites)=15687 submissions
http://www.indexkings.com/

http://mypagerank.net/service_pingservice_index

You have to get backlinks from different platforms so that you can attract search engines bots to your webpages. Free Backlink Generator will create 55 pages about your website and get you 55 backlinks
https://www.seospaceship.com/tools/free-backlink-generator

https://www.prepostseo.com/backlinks-maker

https://www.prepostseo.com/google-index-tool
website indexing tool submit site to google and 65 other search engines with just one click for free

Top 50 Search Engines and Directories
https://www.freewebsubmission.com/