Depends. If it's something I want to do, but just can't find inspiration or am not feeling like it even though I 'want' to, I'll go to my notebook that I keep with me to see if any of my previous ideas I haven't done yet strike me. Or I will go to youtube and watch some making videos. If that doesn't work, I figure it's not worth it to push it, and let it go for a day or so, and try again.
I find that if I'm just not that into it, - that's when I make mistakes, get frustrated, etc., so I will wait to help eliminate that.