Upgraded plan not but not getting new speeds

Upgraded from 175/5 to 400/10 but my speeds have not changed.

Currently speed tests register 200/5

Modem: Motorola MG8702 DOCSIS 3.1 gigabit

No Router

Network adapter is a gigabit adapter.

My plan shows its been updated on my xfinity account but my download and upload speeds remain the same.