Still Guest Post is effective for ranking?

Low-quality guest posting has never been effective, now seeing as we never set out to write a low-quality post it is common that we think our posts are great quality but in reality, they are often poor. Grammar and spelling is also so important.

I don't mean to sound rude, but if your guest posting is to the quality of the question being asked here, then it would be deemed inferior quality. Yes, I can understand what you mean but it would not score highly in googles eyes and remember google is attempting to show the best quality there is available to the question asked. 

Case posting does a lot of good on the site and works quickly to get rank.

It is to be always remembered that Google always prefers the content which is the most relevant and quality-focused for the audience and will only rank them accordingly. So, yes guest posting is still capable of doing wonders provided you focus on the content while maintaining the relevancy.

hire some content editors and ask them write the best content in you niche then publish it on your site and start outreach that will work better than guest posting  

Read this https://moz.com/blog/adt-keyword-ranking-case-study

Guest posting is relevant and effective you must do some quality work and will see the results. 

Yes, Guest Posting is one of the factors in ranking. Keywords should be taken properly and the content of the guest post should be relevant to the one that was being asked by the website owners. Moreover, guest posting and article submissions take a little longer for proper approval of the content as they check all the relevant parameters that are meeting the SEO requirements. As search crawlers consider link juice and rank the particular website based on backlinks and sites having high domain authority to the site. All the guest posting sites should be ethical ones and should not have any blackhat SEO techniques. 

Guest posting is a good way to a good result of SEO. Creating these backlinks can help you climb the search engine ranks over time.

Absolutely! Guest posts remain an effective way to improve your website's ranking, as they allow you to network with others in your field, introduce your brand to a new audience, increase website traffic, establish yourself as an industry thought leader, and even create backlinks to enhance your website's SEO.

If you find it challenging to locate blogs for guest posting, you can use an automation tool called Postifluence. This tool can save you time and help you discover high-quality websites for guest posting.