can someone edit my design (MLA)

hi, i need help for this.

i already design mla to operate at 2.4 gHz,
from the result,
i already obtain impedance = 50 ohm
but i need to get better s11, for now i only get -10 dB and got a little amplify signal.
can someone check my design, and tell me what is wrong and what i need to do next.

thanks