Just practice it. It is a skill in itself just like anything else. It is true that it doesn't actually measure your real skills, but just like an IQ test can be

Just practice it. It is a skill in itself just like anything else. It is true that it doesn't actually measure your real skills, but just like an IQ test can be corollary with lots of other mental faculties, leetcode skill can be corollary to programming skills. I highly doubt that we are talking 3-4 months of memorising riddles. There are a few recurring concepts that you should memorize, sure. But after that, if you have the programming and logical thinking skills you claim to have, you should be able to think on the spot for the rest of the leetcode question.