h1 heading not showing in search engine

Hi there.

this link gynitechraviji.com does not work. The other one does.
Is this only on the homepage ?

if it is then i suggest you use the Site Title in your Site Indentity as this will be set as the homepage H1.

I checked some posts on your sites, and they all have the H1 entry title that the theme displays.
See here for example:

And thats all the theme does with the H1 heading. Nothing more.

I also checked the title tag for that example post:

https://www.gyanitechraviji.com/thinking-effect-in-hindi/

And this is it:

<title>Thinking Effect in hindi हमारे जीवन में सोच का प्रभाव</title>

So it too has a title tag for search engines to use too, But that title tag looks like it has been changed by your SEO plugin.

Your SEO plugin is also adding LD+JSON schema which has an Article type that has the same title as your title tag.

To summarise:

The Theme is only responsible for adding the H1 Entry Title. And it is doing that correctly.
The Title Tag and LD+JSON are being changed/added by your SEO plugin.

If your search results are not showing correctly , i would suggest you speak with the SEO plugin author as its there code that is more likely to affect SERPs rich snippets