I am a final year btech mechanical student and have been coding for a while now (about 6 months) and have solved around 170 leetcode problems (100 easy ,65 med) but now i feel like i am stuck and unable to increase the difficulty of question that i can solve. I never look at the solution not even the hints but now i think i should start doing so but i don't know how to grasp the concept in a way that i will be able to solve those type of questions.
I really don't know what to do feels like i won't be able to better myself anymore.

So can anyone help me out?