If the goal is to better your career, then you should think about two things: interviewing for new roles and advancing in your role. Leetcode-type problems are

If the goal is to better your career, then you should think about two things: interviewing for new roles and advancing in your role. Leetcode-type problems are only part of the interview process. System design interviews are pretty common -- developing a deep understanding of things like SQL, document stores, CAP theorem, parallel programming: all helpful. To advance in your role, it's useful to quantify the value of your work. Data analysis is helpful here. Writing is an undervalued skill for advancing your career as well.