Consensus Group Selection

The Article on developer.helium.com
https://developer.helium.com/blockchain/proof-of-coverage
It says that Hotspot with higher scores are chosen for a consensus group. My hotspot has been scoring well barring a few days but still has not been chosen to take part in Consensus group whereas another hotspot which is some 300 meters away from me has been chosen multiple times for forming a Consensus group. if you exclude the consensus group rewards, that hotspot is scoring almost equivalent to mine. My hotspot score remains low below 0.25 even after scoring well.

May I know what needs to be done in order for my hotspot to be part of the Consensus group? I have an upgraded Antenna but score never went above 0.5