What I like to do personally is start my morning off by blazing through the most important tasks of my day while my energy and focus are at their peak. This may include sending time-sensitive files to a client, responding to emails, and bouncing stems for a performance. Pushing through my important tasks early gives me time to complete more creative tasks during the rest of the day, such as practicing my instrument, working on new material, and writing with collaborators.
Rather than starting by writing lyrics, try exploring different themes and topics through reading, writing, visual art, or anything else that inspires you. Keep a notebook with you at all times. The more you explore art, the more frequently ideas will come to you, and if you don’t write them down, you’ll likely forget. That way, when you start writing lyrics, you can first look at your list of ideas to see if there’s something interesting to start with.