Content plays an important role in this process; however, simply posting more articles will not ensure fast indexing of your blog. In my opinion, useful content, proper website structure, and sitemap submission should be prioritized at this stage.
to begin with i would conduct an audit using google search console by submitting the sitemap nd looking at those pages that have not yet been indexed by google.in many cases there could be an issue of thin content or duplicatted URLs, or links that have not been set up correctly within the website. honestly speaking i would not place my hope on the instant indexing tools, as they cannot give u any guarantees.
Use instant indexing plugin through Google indexing API, which is much faster compared to regular GSC submission process. Add some social signals or even tier 1 backlinks in order to force google bot to crawl urs URLs right away.
You need to use GSC (google search console) and submit your sitemap in order to index more naturally.
I would begin by connecting newer entries on pages that google visits all the tym rather than relying on the sitemap itself. if there were whole parts of the sites not indexed yet then i take that as a hints to investigate why they should be indexed at all.
