What does healing miracles in the gospel really about?

And He said to her, “Daughter, your faith has made you well. Go in peace, and be healed of your affliction.”
Mark 5:34 NKJV

If we isolate verses like these, it does sound like we need to "exercise faith" in order to get healing. And then we extrapolate that principal to believe for financial breakthroughs... you get the prosperity gospel.

But if we zoom out a little and try to understand how the gospel writer crafted the narritives and the message he is trying to convey, we get a better understanding...

Let's look at Mark 2, the beginning of the series of Miracles Jesus performed, what is Mark trying to say?

Which is easier, to say to the paralytic, ‘ Your sins are forgiven you,’ or to say, ‘Arise, take up your bed and walk’? But that you may know that the Son of Man has power on earth to forgive sins” —He said to the paralytic, “I say to you, arise, take up your bed, and go to your house.”

Mark 2:9‭-‬11 NKJV

The question that Jesus asks implies a few things.

1. He uses Miracles to illustrate his power to forgive sins.

2. What do you thing was his priority, restoration of eternal life, or restoraton of physical life which will fade away again?

3. The first thing Jesus answered the Paralytic was not "I will heal you now", its "your sins are forgiven".

4. Miracles proved that Jesus had the authority to forgive sins.

The healing miracles are meant to show Jesus authority to forgive sins. They are here to illustrate his power, the focus is in spiritual restoration, not physical. Mark is trying to prove to the Jews that the Messiah they are waiting for has arrived, he proves himself by performing miracles and therefore has the authority to spiritually restore Israel to God.