Then After one day, I have checked the post on Google search engine, the old title and serp snippet is showing on Google search engine. Updated post title and description showing is not showing. This is a common thing because Google don't update as soon as possible and take few weeks for updating the post. But problem is Then I have gone in Google search console, clicked on Google search url inspection tool, pasted the post url and saw the "URL is on Google with right green tick" then below "URL is on Google" i have clicked on View Crawled page, I have checked all html but But there is no change in the modified article in html. No update in post artical, title, description and content etc. So what steps I should follow to update updated blogger post when after updating the post.

If it still doesn't show your updated content then there might be some cache settings on your site where you have hosted your website.

As you already know Google indexing can take few days or even weeks, so don't worry too much if you are not seeing your updated content in search results.