There is an incident where our Master Son, Jesus Christ told two individuals to make mention about healing, miracles, signs and wonders. And it was a specific instruction for a very specific reason - to encourage John the Baptist:
Matthew 11:2-6, "And when John had heard in prison about the works of Christ, he sent two of his disciples and said to Him, “Are You the Coming One, or do we look for another?”
Jesus Christ discouraged unnecessary noise about the miraculous because he knew such a practice would create distractions from the spiritual work of spending quality time in dishing out teachings that would transform souls; transform people's character inside-out; teachings that would cause them to grow spiritually and be drawn closer to the Father - to forge a living and a vibrant one-on-one personal relationship with the heavenly Father.
Placing too much emphasis and time on healing, miracles, signs and wonders can have an adverse effect of people just coming to God for what they think they can get from God without being interested in the ways of God. They also may become lazy and fail to use their brains to develop man-made cures for their physical maladies or physical, natural problems. Advancements in man's work, for example, Science and Technology, the Arts, etc would suffer.
Does God perform miracles today to solve physical or material problems? Of course, "Yes". God intervenes. However, he would prefer humankind discovers and comes up with the cures or solutions. That's one of the reasons he gave us a brain. God would rather focus on our salvation and spiritual development. These are things Science and Technology (for example) cannot do for us. But the things Science and Technology can do for you, God would rather have you get them done through Science and Technology. Nevertheless, in his infinite love and mercies, he still intervenes for us, even to this day. Amen.