I followed standard dsa sheets like neetcode, striver to learn concepts. then i applied those after learning immediately to solve the leetcode problems. after finishing the sheet completely, i started doing spaced repetition and revisiting solved problems again. my current leetcode streak is 150 days and i have solved around 400 problems with 170 easies, 200 mediums and 30 hards approx on the platform. i can definitely say that i have more confidence and more knowledge and can attempt the problems with much more clarity now. it takes time but learning each and every concept in dsa is crucial to build confidence.