It is Allāh ﷻ who makes a time or a place or a person holy. It is not up to what we think or what is convenient. These holy months change according to the moon calendar. He ﷻ makes them holy as He ﷻ has also chosen Mecca and Medina; as He ﷻ has chosen the Prophet ﷺ and his Ṣaḥābah. We cannot change this.