Fabricated Spontaneity

I am usually most motivated and most focused on a project when it’s onset it somewhat spontaneous. That spontaneity and novelty is part of what makes certain projects exciting. How can I capture that feeling for the long term? Is it possible to create or plan spontaneity? I guess there’s a balance here like with anything. I need to plan and make time for working on different project, but not to the point where it feels like an obligation. But if I don’t make it an obligation will it ever get done? I guess if it’s important enough to me. It’s interesting how averse we can be to being told what to do and when to do it and how that affect our choices.