«Когда мой партнёр увидел концепцию, то сначала охуел, потом был в шоке, а потом ему понравилось»
Though creativity cannot be taught, it can certainly be nurtured. Find a routine that works for you. Routines can be positive if they reinforce a healthy, creative mindset; they can be counterproductive if they actually keep you from being creative. While breaking your routine once in a while to force new ways of thinking is good, what if growing/learning/experiencing new things was built into your routine as a given? The people who speak negatively about routine have probably not developed a routine that puts them on a path of internal growth. The key is to discover creative rituals that put you in a more creative mindset.
Though creativity cannot be taught
I think if you do something and it turns out pretty good, then you should go do something else wonderful, not dwell on it for too long.