hey every one i see alot of problems that its solutions (in editorials) depends on making an assumption then it follow it untill it reach to the solution this is very counter intutive to me what can i do to be able to be better in this kind of thinking?
This is common. You can study more maths and read some books about maths such as Concrete Mathematics and so on...
Therefore you can solve as many problems as you want!
To improve in some topic you shouldn't create new accounts and should start practicing.