Not getting upload speeds

Good afternoon, 

I recently upgraded my cable modem speeds from 1. 2 GB to the multi-gig 2 GB.  I was only getting around 40 MB uploads before and was expecting to get at least 150 to 200 Mbps based upon the advertised speeds of up to 300mps

I have seen in other forum posts where you have had to reprovision the modem. I was wondering if this could be done to fix mine