Mercury after sunset in the southwestern sky, January 19-30, 2021.
Image created in Stellarium software.

The observing window for Mercury this month runs from January 13 to February 3. You will find the planet in the southwest after sunset. Typically, the glare of the Sun will hinder seeing Mercury until 30 minutes after sunset. Your best bet to find Mercury will then be between January 19 and January 31.