Thank you for your question. We need God as without Him a human cannot reach their spiritual and material perfection. Wealth and position are not perfections for a human, but wisdom, knowledge and purity are. Our need for Him is based on an internal yearning, which is not always sensed, but a person will feel that yearning within them at certain times strongly. That yearning stems from the natural connection we have with Him as His creatures. Without God life loses purpose and meaning. We need Him because without Him we live a life of falsehood and we will bear the consequences of that falsehood when we leave the blindness of the material realm and the overwhelming truth of God is manifest.
As for why this should be God rather than any other creator, it is because God possesses every beautiful attribute. We worship and serve Him because He is worthy of that, and His Unlimited nature doesn't leave room for glory to belong to anything else. Any perfection that you see attributed to any person or being belongs to God. He is the origin of all and unlimited in His perfection. Therefore, it stops at God because in truth God encompasses all. All created beings finally need a creator who is not created, and that is God.
May you always be successful