gibes-anand Request you to please create a new super user.
The only way to restore your super user account is via database, we cannot act directly on users databases, you will need to restore your account for some reason you disabled before, using steps described on this tutorial
As already mentioned above css and js optimizations are not related in any way to accounts managements so this forum is not the right place where you can ask for help on this matter, regarding your issues with gzip compression when enabled crashes your website as i already answered it is not a template issue but it is core joomla issue, in both cases you should ask for help on joomla forum , www.joomla.org
Hope this clarify all your questions.
Regards