Need help in enhancement of gain

HELLO
I HAVE DESIGNED A PATCH ANTENNA IN WHICH I M GETTING RETURN LOSS OF -55.56 dBi BUT GAIN IS TOO LOW (ONLY 5.78).I WANT TO ASK THAT HOW CAN I ENHANCE THE GAIN.
I HAVE DESIGNED AND SIMULATED THE PATCH ANTENNA WITHOUT GROUND PLANE. I M LOADING THE DESIGN OF THE PATCH ANTENNA, PLEASE GUIDE ME TO ENHANCE THE GAIN

REGARDS
SAMEER