ANSWER: Concerning why God does not reveal himself more to humans, the Bible says what can be known of him should be clear to anyone who studies what he has made. The clockwork mechanism of the universe, the laws of physics, the functioning of the human anatomy and so on are concrete evidences of a Creator. Those who fail or refuse to discern his unlimited divine power and wisdom by observing creation are without excuse (Romans 1:18 - 20).
I discovered for myself the existence of God philosophically and logically by trying to find the answer to the repeated question, "Where did THAT come from?" Eventually, even considering the possibility of a "Big Bang" and other scientific theories concerning the universe, I came to the point where the only answer is either God or some other term designating a creator - what some call a "prime cause." Any human who thinks the expanding universe and the complexity of all living creatures just came about through random chance and other evolutionary processes has taken a far bigger leap of faith than the 'blind' faith they accuse Christians of possessing. To me, the necessity of a Creator could not be more OBVIOUS.
WHY is it that he wants us to search for him? WHY does he not remove all doubt about himself by coming to EACH of us personally and introducing Himself? One reason he does not do this is that human nature generally does not value or fully appreciate something that comes to it cheaply or without costing something (time, money, effort, etc.).
Once someone establishes the existence of a Creator the next step is to discern the meaning and purpose of his or her lives as it relates to that Creator. This requires searching and discovering the TRUE meaning of life. The writer of Proverbs 25 states that the Eternal KNOWINGLY conceals things so that we may search them out (Proverbs 25:2).
27. In order that they might seek the Lord, if perhaps they might feel after Him and might find Him; though truly, He is not far from each one of us, (Acts 17:27)
Your question shows that you are on the track to finding Him, as there are MANY "gods" available for us to find. For most humans, their "deity" is the person, idea, or desire that occupies the uttermost respect and love in their minds. For some, it is sex, or money, or power, or even another human being.
My personal search for God led me to conclude that there is a common flaw in most religions such as Zoroastrianism, Hinduism, Buddhism, Islam and even modern Christianity. That fatal flaw is that these religions give human beings a philosophical EXCUSE for a lack of personal responsibility. It is not necessary to strive to achieve one's potential to be "saved" or to reach Nirvana. There is an element of "magic" that is introduced in these religions that "changes" everything; human beings are “powerless" to overcome the "call" -- it is completely beyond the control of the individual. One can become part of a group that believes these fantasies and pretend to be in on the magic. Such things lead to philosophical and mental stagnation and hypocrisy.
The Bible provides real answers to all the major philosophic questions such as why man exists and what is the ultimate destiny of mankind. These answers are available to those who read the Bible with a truly open mind and heart and ask for help to understand its profound lessons. It is not easy, but any person can do it. Finding the answers to the basic questions of life along with the strongest motivation possible to strive to reach your potential is the immediate reward for the search.
Trust in God and ask Him to help you find Him. If you seek after him you will find him and he will reveal himself to you (Matthew 7: 7 - 8, 11).