With the definations in my description taking in mind:-
Lets imagine a human child left with a pack of wolves, this has actually been done a lot of times before
As we can see from here, the human never tried to build anything like tools to survive,
I think most probably because he didn't even know what a tool was.
Just like this i think what humans have that is different from other animals as of current moment is communications through language, with this the information that one human learn can passed on other example lets create a imaginary humans, he realised he can hit animals with rocks passed on his descendent that thinks that rock can sharpen to Pierce and another descendent starts thinking of it connecting to a big wood piece to make what we now named a spear, this human soon step by step had information passed onto him which they build up upon and also adapted by having better and better hands to hold tools, precise motor control, etc. And other humans who didn't most probably died so only ones with precise hands to hold tools survived.
Humans solve problems today because they are aware these problems exist in the first place, and then they have to be willing to actually solve that problem is where mindset comes into play.
They have to make a decision to be willing to risk their time that could been used to stay in their comfort zone and being uncomfortable, why? Curiousity. Which also accounts in my defination of mindset.
their curiousity has to weigh more than their uncomfortability and be excited while doing it, why? because "Excitement can also extend the positive feelings you get from an activity. If you focus on your excited feelings of anticipation, the fun of a vacation can extend into the days and weeks before you even leave."
So our minds will repeat those things because they made us happy and each time we fail we get back up because we are mainly doing it for excitement rather than the end result
This process is called trial and error
"Trial and error is a fundamental method of problem-solving characterized by repeated, varied attempts which are continued until success, or until the practice stops trying"
So in conclusion to solve a problem
1. You have to know a problem exists
2. Your curiousity has to outweigh your uncomfortability that you get when you try something new
3. You have to be curious enough to be excited while doing it, so you pull yourself back up every time you fail and see what you did wrong, not do it again, repeat
4. Problem solved.
Hence according to this reasoning- intelligence is all mindset.