How can one overcome job vacancy in government work and attain a position that aligns with high academic and administrative qualifications?

There is no blame upon you for your manager not assigning you any work, as long as you adhere to your attendance and departure times, and you have not refused any work assigned to you within the scope of your job. You should utilize your free time for what benefits you in your religion and worldly life, and diligently search for another job that suits your qualifications and abilities.