Core Web Vitals

Why not upgrade to the current version of WordPress?

You can do it from Dashboard > Updates in your site’s Dashboard.

Thank You for your response. I already mentioned that I am using latest version of wordpress.

Currently I am using latest version of wordpress

Whoops, don’t know why I glanced over that.

I read that on new version of wordpress these js is not being used.

In the current version of WordPress, these files do exist and are in use.

We have some general recommendations at https://www.ads-software.com/support/article/optimization/

Then how can I fix it in google webmaster tools?
LCP issue: longer than 4s (mobile)
LCP issue: longer than 4s (desktop)
CLS issue: more than 0.25 (desktop)

We have some general recommendations at https://www.ads-software.com/support/article/optimization/

in google pagespeed I can see that
Remove unused JavaScript
Remove unused JavaScript to reduce bytes consumed by network activity

js/jquery/jquery.js
js/jquery/jquery-migrate.min.js

these both js comes there in unused js. Is it required for wp? or Do I need to delete these js from server?

Never delete core WordPress files. Just because they’re unused when the test checks doesn’t mean they aren’t used elsewhere in the site.

these urls are showing in pagespeed under Eliminate render-blocking resources

https://www.example.com/wp-includes/js/jquery/jquery.js
https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js

If I defer these js then in google pagespeed my score goes to 94. But now problem is images are not showing on my website homepage. If I remove defer then score goes down to 45 but homepage images are showing. When it goes to 45 then First Contentful Paint (FCP) and Largest Contentful Paint (LCP) becomes 6seconds+. Any way to fix it?

First, stop trying to get a perfect score in pagespeed, it’s not a game to win.

As you have noticed already by deferring critical JS and breaking your images, you can always continue to check things off their list, but eventually you’ll just start crippling your site.