Computational thinking

How much programming have you done? Computational thinking is all about learning new ways of thinking about problem solving. The only way to really understand it is by learning programming and practicing solving problems for yourself (using a real programming language so that you can actually create and test the solution properly). It takes time, and isn't something that comes naturally to most people, but with enough practice it'll eventually click and start to feel more intuitive.

Have a look at some of these videos which explain the techniques you need to practice: https://student.craigndave.org/videos/2-1-algorithms

Here's some programming challenges you can practice with: https://www.ocr.org.uk/Images/260930-coding-challenges-booklet.pdf