Hello @jobair1
The issue is almost certainly related beloved two things
1) You don’t have permissions because you are not login as a admin (are you logged in as admin?)
OR
2) The theme or a plugin has disabled the plugins menu.
After you’ve checked to be sure that you are an admin, then you should attempt view this page:
https://www.yourdomain.in/wp-admin/plugins.php (replacing https://www.yourdomain.in with your site’s domain name).
If it’s accessible, then it’s time to start exploring the theme (which theme are you using?) and possibly some of the plugins that might have disabled the menu item.