Dude, like acbc said there there is no settings to boost the wifi signal. U can however try to change the wifi channel and test if there is any difference. Normally default wifi channels for phone hotspots is 6 and broadband channels is 11. Why not set to manual in your wifi settings and change to other channels besides this. Also there are many apps which you can download to check which wifi channel is better for you in your location.

Maxis helper, any suggestions?