Even many of the theists mentioned within the Bible itself asked why they didn’t see miracles. And that’s because even within the Bible’s own timeline miracles were extremely rare—and those miracles which did occur were restricted to a very few, relatively short periods of time and definitely limited geography. Indeed, the miracles described in the Bible were not at all “impressive” in terms of frequency except in:
(1) the Exodus from Egypt (e.g., Moses and the plagues of Egypt pericopes) and
(2) the three years of the ministry of Jesus Christ.
Yes, there were other “eras” in the Bible when miracles occurred, such as the lives of the Genesis patriarchs, the conquest of Canaan, some of the deeds of the Judges before the Monarchy, the ministries of Elijah and Elisha, as well as with the Apostles of the early Church. Nevertheless, those less frequent miracles were not at all like the daily miracles that were described in association with Jesus’ three year ministry nor even like the series of miracles associated with Moses before Pharoah. Even a casual reading of the Bible reveals that one could wait many centuries fell before another miracle occurred.
Why? That’s another thread topic but Jesus taught that a demand for miracles was not necessarily a virtue, to say the least.