[random opinion from the internet]
I am hesitant about the term "design thinking" because it somewhat implies that design is in the head rather than the hand. Design is a process that generates many artifacts out in the real world and the premise is that most of them will not be 'good enough.'
To me, design thinking means thinking by creating designs. Out in the real world. Not in the head. My maximum is "there is no such thing as a design in my mind." If it is not on paper (i.e. there is not a 'hard copy'), then it isn't really a design. The way to cultivate design thinking is doing design and failing and figuring out why things work and don't work.
A design is done when time runs out.
Good luck.