First, set the General Policy as wanted. I suggest not to use Detect in Activation Mode:
Then, instead of activating selected signatures with: Threat Year > 2015 only, just deactivate all signatures with: Threat Year < 2016:
With Protections to Activate Any you can be sure to get all the newest protections activated (if they fall into your General Profile). As there is no Year: 2021 you would not get newer protections than 2020 activated if you use a Threat Year list here...
CCSP - CCSE / CCTE / CTPS / CCME / CCSM Elite / SMB Specialist