There's great advice in a book called The Accidental Creative (also a podcast!) You are called on to have brilliant ideas at a moment's notice. To do that, you have to feed your inspiration by purposefully spending time exploring ideas. You can't constantly output without input.
I also love Neil Fiore's book "The Now Habit" - he recommends scheduling in "guilt free play," and other techniques to overcome procrastination. We have to build in time to develop ideas, and it might not look absolutely productive, and it might not be billable time either.
When you're running on empty take time to get curious about something, and really dig into it. Maybe you need to go for a walk and listen to a podcast or a talk from a conference.
Chaining yourself to your desk hoping your muse will come to you isn't helping.
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