iFixit

While continually trying to click your trackpad, gently tighten the T6 Torx set screw until the clicks return to their factory "feel."

You can tell when the screw is tightened just right by the noise it makes when the trackpad clicks. If the set screw is too loose, the trackpad will have excessive play before it clicks. If it is too tight, the trackpad will click too easily and won't make the characteristic loud mouse clicking noise.

Next, flip your upper case over so the keyboard side is facing up.

Align the trackpad so it is centered in its hole cut into the upper case.

Tighten the outer two screws along the inner edge of the trackpad and check the alignment of it on the outer side of the upper case.

If its alignment looks good, install the rest of the Phillips screws along the inner edge of the trackpad.

Before reassembling your machine, verify that the set screw is still installed in a position so the mouse will click correctly.