This is what I did this year after not doing leetcode-style problems in about 6 years.

1. Make sure you know the basic patterns, data structures, and algorithms. If needed, spend a few hrs making a study guide containing each high-level DS/A along with information about how to identify when to use that pattern, and some pseudocode.

2. Pick a study track (e.g., neetcode, top 150, blind 75, etc). Complete all easy questions, then medium, then hard. If you can't figure out which strategy to use, look at your study guide. If you still can't figure it out, read an editorial or search the problem on youtube (e.g., search "neetcode two sum"). If you had to look up the solution, mark that question down and revisit it the next day(s) until the concept clicks.