I can't remember where I read it so can't even begin to look for it again. But it was a fascinating bit on crop rotation and the human mind.
Merriam-Webster defines crop rotation as: the practice of growing different crops in succession on the same land chiefly to preserve the productive capacity of the soil.
This thing (article? Tumblr? tweet?) compared moving from one project to another as not failing but as keeping your mind fertile. Need a break from that big project? Do something else. You aren't failing, merely letting your mind rest from A by working on B. Need to rest from both A and B? No prob, here's a fun project C to pass the time.Pushing aside a project doesn't mean anything other than you needed a break and it'll be there again in a day or week or whenever's time. Take care of yourself.